1. T. A. Kurniawan, X. Liang, D. Singh, M. H. D. Othman, H. H. Goh, P. Gikas, A. O. Kern, T. D. Kusworo and J. A. Shoqeir, 2021, "Harnessing landfill gas (LFG) for electricity: A strategy to mitigate greenhouse gas (GHG) emissions in Jakarta (Indonesia)", Journal of Environmental Management, Vol.: 301, 113882, IF: 5.647. https://doi.org/10.1016/j.jenvman.2021.113882
  2. G. Makaroglou, H. Marakas, S. Fodelianakis, A. Axaopoulou, I. Koumi, N. Kalogerakis and P. Gikas, 2021, "Optimization of biomass production from Stichococcous sp. biofilms coupled to wastewater treatment", Biochemical Engineering Journal, Vol.: 169, 107964, IF: 3.475. https://doi.org/10.1016/j.bej.2021.107964  
  3. V. Manasaki, I. Palogos, I. Chourdakis, K. Tsafantakis and P. Gikas, 2021. "Techno-economic assessment of LFG to electric energy technologies at a municipal landfill: Model simulation and field measurements", Chemosphere, Vol.: 269, 128688, IF: 5.778. https://doi.org/10.1016/j.chemosphere.2020.128688
  4. N.P. Raval, S. Mukherjee, N.K. Shah, P. Gikas, and M. Kumar, 2021, "Hexametaphosphate Cross-linked Chitosan Beads for the Eco-efficient removal of Organic Dyes: Tackling Water Quality", Journal of Environmental Management, Vol.: 280, 111680, IF: 5.647. https://doi.org/10.1016/j.jenvman.2020.111680
  5. M. Tun, H. Raclavská, D. Juchelkova, J. Růžičková, M. Safář, K. Štrbová and P. Gikas, 2020, "Spent Coffee Ground as Renewable Energy Source: Evaluation the Drying Processes", Journal of Environmental Management, Vol.: 275, 111204, IF: 5.647. https://doi.org/10.1016/j.jenvman.2020.111204
  6. E.Vaiopoulou and P. Gikas, 2020, "Regulations for Chromium Emissions to the Aquatic Environment in Europe and Elsewhere", Chemosphere, Vol.: 254, 126876, IF: 5.778. https://doi.org/10.1016/j.chemosphere.2020.126876
  7. H. Huang, L. Luo, L. Huang, J. Zhang, P. Gikas and Y. Zhou, 2020, "Effect of Manure Compost on Distribution of Cu and Zn in Rhizosphere Soil and Heavy Metal Accumulation by Brassica juncea", Water, Air, & Soil Pollution, Vol.: 231 (195), Pp.: 195, IF: 1.900. https://doi.org/10.1007/s11270-020-04572-4
  8. A. Siatou, A. Manali and P. Gikas, 2020, "Energy Consumption and Internal Distribution in Activated Sludge Wastewater Treatment Plants of Greece", Water, Vol.: 12, 1204, Pp. 1-16, IF: 2.544. https://doi.org/10.3390/w12041204
  9. I.G.. Priede, R.W. Burgass, M. Mandalakis, A. Spyros, P. Gikas, F. Burns and J. Drewery, "Near Equal Compressibility of Liver Oil and Seawater Minimises Buoyancy Changes in Deep-Sea Sharks and Chimaeras", Journal of Experimental Biology, 223, jeb222943, IF: 3.014. https://doi.org/10.1242/jeb.222943
  10. M. Kumar, A.K. Thakur, P. Mazumder, K. Kuroda, S. Mohapatra, J. Rinklebe, A.L. Ramanathan, Z. Cetecioglu, S. Jain, V.K. Tyagi, P. Gikas, S. Chakraborty, M.T. Islam, A. Ahmad, A.V. Shah, A.K. Patel, T. Watanabe, M. Vithanage, K. Bibby, M. Kitajima and P. Bhattacharya, 2020, "Frontier review on the propensity and repercussion of SARS-CoV-2 migration to aquatic environment", Journal of Hazardous Materials Letters, Vol.: 1, Pp.: 100001, https://doi.org/10.1016/j.hazl.2020.100001 
  11. M. Farazaki and P. Gikas, 2019, Nitrification-Denitrification of Municipal Wastewater without Recirculation, Using Encapsulated Microorganisms”, Journal of Environmental Management, Vol.:242, Pp.: 258-265, IF: 5.647.  https://doi.org/10.1016/j.jenvman.2019.04.054
  12. M. Elhag, I. Gitas, A. Othman, J. Bahrawi and P. Gikas, 2019, “Assessment of Water Quality Parameters Using Temporal Remote Sensing Spectral Reflectance in Arid Environments, Saudi Arabia”, Water, Vol.: 11(3), Pp.: 556, IF: 2.544. https://doi.org/10.3390/w11030556
  13. S.S. Şengor, P. Gikas and J.G. Moberly, 2019, Single and Joint Effects of Zn and Cu to ATP Pool and Microbial Recovery in Continuous Growth Systems”, Journal of Chemical Technology and Biotechnology, Vol.: 94(3), Pp.: 892-899, IF: 2.750. https://doi.org/10.1002/jctb.5836
  14. K. Moustakas, P. Gikas, S. Malamis and E. Ranieri, 2018. “Sustainable Waste and Wastewater Management”, Editorial, Journal of Environmental Management, Vol.: 216, P.p.: 1-3, IF: 5.647. 10.1016/j.jenvman.2018.04.024
  15. P. Gikas, B. Zhu, N.-I. Batistatos and R. Zhang, 2018Evaluation of the Rotary Drum Reactor Process as Pretreatment Technology of Municipal Solid Waste for Thermophilic Anaerobic Digestion and Biogas Production”, Journal of Environmental Management, Vol.:216, Pp.: 96-104, IF: 5.647. https://doi.org/10.1016/j.jenvman.2017.07.050
  16. P. Gikas, S. Malamis, K. Moustakas and D. Bolzonella, 2017, “Waste Management”, Editorial, Journal of Environmental Management, Vol.: 203, Pp.: 619-620, IF: 5.647. https://doi.org/10.1016/j.jenvman.2017.08.056
  17. P. Gikas, E. Ranieri, D. Sougioultzis, M. Farazaki and G. Tchobanoglous, 2017, “Alternative collection systems for decentralized wastewater management: An overview and case study of the vacuum collection system in Eretria town, Greece”, Water Practice and Technology, Vol.:12, Iss.: 3, Pp.: 604-618, IF: 0.510. https://doi.org/10.2166/wpt.2017.050
  18. P. Gikas, 2017, “Towards Energy Positive Wastewater Treatment Plants”, Journal of Environmental Management, Vol.: 203, Iss.: 2, Pp.: 621-629, IF: 5.647. https://doi.org/10.1016/j.jenvman.2016.05.061
  19. P. Gikas, 2017, “Ultra High Temperature Gasification of Municipal Wastewater Primary Biosolids in a Rotary Kiln Reactor for the Production of Synthesis Gas”, Journal of Environmεntal Management, Vol.: 203, Iss.: 2, Pp.: 688-694, IF: 5.647. https://doi.org/10.1016/j.jenvman.2016.02.043
  20. A. Emdadi, P. Gikas, M. Farazaki and Y. Emami, 2016, “Salinity Gradient Energy Potential at the Hyper Saline Urmia Lake - Zarrinehrud River System in Iran”, Renewable Energy, Vol.: 86, Pp.: 154-162, IF: 6.274. https://doi.org/10.1016/j.renene.2015.08.015
  21. S. Wang, L. Peng, Y. Jiang, P. Gikas, B. Zhu and H. Su, 2016, “Evaluation of a Novel Split-Feeding Anaerobic/Oxic Baffled Reactor (A/OBR) for Foodwaste Anaerobic Digestate: Performance, Modeling and Bacterial Community”, Scientific Reports, Vol.: 6, Article: 34640, Pp.: 1-13, IF: 3.998. https://doi.org/10.1038/srep34640
  22. P. Gikas,S. Liu, L.G. Papageorgiou and F. Konstantopoulou, 2016, “The Role of Reclaimed Water in Optimal Management of Islands’ Water Supply and Sewerage Infrastructure”, Water Supply Association Journal (水道協会雑誌), Vol.: 85, Iss.: 5, Pp.: 13-15. (In Japanese). https://ci.nii.ac.jp/naid/40020823325/en/
  23. E. Ranieri, F. Bombardelli, P. Gikas, and B. Chiaia, 2016, Soil Pollution Prevention and Remediation”, Editorial, Applied and Environmental Soil Science, Vol.: 2016, Pp.: 1-2, Article ID 9415175, IF: 1.390. http://dx.doi.org/10.1155/2016/9415175
  24. S. Kumar, P. Hettiaratchi, N. Ashwath and P. Gikas, 2015, “Toxicity of Environmental Contaminants”, Editorial, BioMed Research International, Vol.: 2015, Pp.: 1, Article ID 702439, IF: 2.140. http://dx.doi.org/10.1155/2015/702439
  25. E. Ranieri, A. Gorgoglione, A. Pertella, V. Petrutzzelli and P. Gikas, 2015, “Benzene removal in Horizontal Subsurface Flow Constructed Wetlands treatment”, International Journal of Applied Engineering Research, Vol.: 10, Iss.: 6, Pp.: 14603-14614, IF: 0.510. https://www.researchgate.net/publication/277444349
  26. S. Liu, F. Konstantopoulou, L.G. Papageorgiou and P. Gikas, 2015, “Optimal planning of water and wastewater management infrastructure for insular areas: The role of water reuse”, Water Science and Technology: Water Supply, Vol.: 15, Iss.: 4, Pp.: 701-708, IF: 0.900. https://doi.org/10.2166/ws.2015.017
  27. P. Gikas and T. Tsoutsos, 2015, “Near Zero Energy Wastewater Treatment Plants for the Greek Islands”, Desalination and Water Treatment, Vol.: 53, Iss.: 12, Pp.: 3328-3324,IF: 0.854. https://doi.org/10.1080/19443994.2014.934109
  28. A.N. Angelakis and P. Gikas, 2014, Water Reuse: Overview of current practices and trends in the World with emphasis in EU states”, Water Utility Journal, Vol.: 6, Pp.: 67-78. http://www.ewra.net/wuj/pdf/WUJ_2014_08_07.pdf
  29. E. Ranieri, A. Gorgoglione, C. Montanaro, A. Iacovelli and P. Gikas, 2014, “Removal capacity of BTEX and metals of constructed wetlands under the influence of hydraulic conductivity”, Desalination and Water Treatment, Vol.: 56, Iss.: 5, Pp. 1-8, IF: 0.854. https://doi.org/10.1080/19443994.2014.951963
  30. S.S. Sengor and P. Gikas, 2014, "The influence of single and combined effects of Zn, Cu and temperature on microbial growth", Global Nest Journal, Vol.: 16, Iss.: 4, Pp.: 699-706, IF: 0.983. https://doi.org/10.30955/gnj.001418
  31. P. Gikas, 2014, “Electrical energy production from biosolids: A comparative study between anaerobic digestion and ultra-high-temperature gasification”, Environmental Technology, Vol.: 35, Iss.: 17, Pp.: 2140-2146, IF: 2.213. https://doi.org/10.1080/09593330.2014.895049
  32. E. Ranieri and P. Gikas, 2014, “Effects of plants for reduction and removal of hexavalent chromium from a contaminated soil”, Water, Air, & Soil Pollution, Vol.: 225, Pp.:1981-1989, IF: 1.900. https://doi.org/10.1007/s11270-014-1981-2
  33. V.M. Daskalaki, H. Marakas, D. Mantzavinos, A. Katsaounis and P. Gikas, 2013, “Use of Seawater for the Boron-Doped Diamond Electrochemical Treatment of Diluted Vinasse Wastewaters”, Water Science and Technology, Vol.: 68, Iss.:11, Pp.: 2344-2350, IF: 1.638. https://doi.org/10.2166/wst.2013.496
  34. S.S. Sengor, T. Ginn, C.J. Brugato, and P. Gikas, 2013, "Anaerobic Microbial Growth near Thermodynamic Equilibrium as a Function of ATP/ADP Cycle: The Effect of Maintenance Energy Requirements", Biochemical Engineering Journal, Vol.: 81, Pp.: 65-72, IF: 3.475. https://doi.org/10.1016/j.bej.2013.10.006
  35. P. Gikas, E. Ranieri and G. Tchobanoglous, 2013, "Removal of Iron, Chromium and Lead from Wastewater by Horizontal Subsurface Flow Constructed Wetlands", Journal of Chemical Technology and Biotechnology, Vol.:88, Iss.: 10, Pp.: 1906-1912, IF: 2.750. https://doi.org/10.1002/jctb.4048
  36. E. Ranieri, P. Gikas and G. Tchobanoglous, 2013, "BTEX Removal in Pilot Scale Horizontal Subsurface Flow Constructed Wetlands", Desalination and Water Treatment, Vol.: 5, Pp.: 3032-3039, IF: 0.854. https://doi.org/10.1080/19443994.2012.748453
  37. M. Kellis, I. Kalavrouziotis and P. Gikas, 2013, "Review on Wastewater Reuse in the Mediterranean Countries, Focusing on Regulations and Policies for Municipal and Industrial Applications", Global Nest Journal, Vol.: 15, Iss.: 3, Pp.: 333-350, IF: 0.983. https://doi.org/10.30955/gnj.000936
  38. E. Vaiopoulou and P. Gikas, 2012, "Effects of Chromium on Activated Sludge and on the Performance of Wastewater Treatment Plants: A Review", Water Research, Vol.: 46, Pp.: 549-570, IF: 9.130. https://doi.org/10.1016/j.watres.2011.11.024
  39. S. Liu, L.G. Papageorgiou and P. Gikas, 2012, "Integrated Management of Non-Conventional Water Resources in Anhydrous Islands", Water Resources Management, Vol.: 26, Pp.: 359-375, IF: 2.924 https://doi.org/10.1007/s11269-011-9921-z
  40. S.S. Sengor, P. Gikas, T.R. Ginn, J. Moberly and B. Peyton, 2012 "Comparison of Single and Joint Effects of Zn and Cu in Continuous Flow and Batch Reactors", Journal of Chemical Technology and Biotechnology, Vol.: 87, Iss.: 3, Pp.: 374-380, IF: 2.750. https://doi.org/10.1002/jctb.2730
  41. F. Konstantopoulou, S. Liu, L.G. Papageorgiou and P. Gikas, 2011, "Water Resources Management for Paros Island, Greece", International Journal of Sustainable Water and Environmental Systems, Vol.: 2, Iss.: 1, Pp.: 1-6. DOI: 10.5383/swes.02.01.001
  42. S. Liu, F. Konstantopoulou, L.G. Papageorgiou and P. Gikas, 2011, "A Mixed Integer Optimisation Approach for Integrated Water Resources Management", Computers & Chemical Engineering, Vol.:35, Pp.: 858-875, IF: 4.000. https://doi.org/10.1016/j.compchemeng.2011.01.032
  43. S. Liu, L.G. Papageorgiou and P. Gikas, 2011, "Management of Desalinated Seawater, Wastewater and Reclaimed Water in Insular and Geographically Isolated Areas Using Optimisation Techniques", Desalination and Water Treatment, Vol.: 33, Pp.: 3-13, IF:0.854. https://doi.org/10.5004/dwt.2011.2610
  44. B. Zhu, R. Zhang, P. Gikas, J. Rapport, B. Jenkins, X. Li, 2010, "Biogas Production from Municipal Solid Wastes Using an Integrated Rotary Drum and Anaerobic Phased Solids Digester System", BioresourceTechnology, Vol.:101, Pp.: 6374-6380, IF: 7.539.  https://doi.org/10.1016/j.biortech.2010.03.075
  45. S.S. Sengor, C.J. Brugato, P. Gikas, M. Fletcher and T.R. Ginn, 2009, "A Comparison of Approaches to Model Thermodynamics and Maintenance Energy Requirements of Microbial Metabolism", Geochimica et Cosmochimica ACTA, Vol.: 73, Iss.: 13, (Goldschmidt Abstracts 2009 – S), Pp.: A1196, IF: 4.659. https://doi.org/10.1016/j.gca.2009.05.015
  46. R. Zhang, J. Rapport, P. Gikas, B. Zhu, B. Jenkins, J. Lord and C. Choate, 2009, "Pretreating MSW Prior to Anaerobic Digestion",  BioCycle, Vol.: 50, Iss.:4, Pp.: 20-25, IF: 0.060.
  47. P. Gikas, S.S. Sengor, T. Ginn, J. Moberly and B. Peyton, 2009, "The Effects of Heavy Metals and Temperature on Microbial Growth and Lag", Global Nest Journal, Vol.: 11, Iss.: 3, Pp.: 325-332, IF: 0.983. https://doi.org/10.30955/gnj.000611
  48. P. Gikas and A.N. Angelakis, 2009, "Water Resources Management in Crete and in the Aegean Islands, with Emphasis on the Utilization of Non-Conventional Water Sources", Desalination, Vol.: 248, Pp.: 1049-1064, IF: 7.098. https://doi.org/10.1016/j.desal.2008.10.021
  49. S.S. Sengor, S. Barua, P. Gikas, T.R. Ginn, B. Peyton, R.K. Sani and S.F. Spycher, 2009, "Influence of Heavy Metals on Microbial Growth Kinetics Including Lag Time: Mathematical Modeling and Experimental Verification", Environmental Toxicology and Chemistry, Vol.:28, Iss.: 10, Pp.: 2020-2029, IF: 3.152. https://doi.org/10.1897/08-273.1
  50. P. Gikas and G. Tchobanoglous, 2009, "Sustainable Use of Water in the Aegean Islands", Journal of Environmental Management, Vol.: 90, Pp.: 2601-2611, IF: 5.647. https://doi.org/10.1016/j.jenvman.2009.01.020
  51. B. Zhu, P. Gikas, R. Zhang, J. Lord, B. Jenkins and X. Li, 2009, "Characteristics and Biogas Production Potential of Municipal Solid Wastes Pretreated with A Rotary Drum Reactor", Bioresource Technology, Vol.: 100, Iss: 3, Pp.: 1122-1129, IF: 7.539. https://doi.org/10.1016/j.biortech.2008.08.024
  52. P. Gikas and G. Tchobanoglous, 2009, "The Role of Satellite and Decentralized Strategies in Water Resources Management", Journal of Environmental Management, Vol.: 90, Iss.: 1, Pp.: 144-152, IF: 5.647. https://doi.org/10.1016/j.jenvman.2007.08.016
  53. P. Gikas, 2008, "International Practices in Water Reclamation and Reuse", Hydroeconomy, Vol.: 63, Pp.: 20-28 (In Greek).
  54. P. Gikas, 2008, "Commissioning of the Gigantic Anaerobic Sludge Digesters at the Wastewater Treatment Plant of Athens", Environmental Technology, Vol.: 29, Pp.: 131-139, IF: 2.213. https://doi.org/10.1080/09593330802028469
  55. P. Gikas, 2008, "Single and Combined Effects of Nickel and Cobalt Ions on Activated Sludge and on other Aerobic Microorganisms: A Review", Journal of Hazardous Materials, Vol.: 159, Pp.: 187-203, IF: 9.038. https://doi.org/10.1016/j.jhazmat.2008.02.048
  56. P. Gikas and G. Tchobanoglous, 2007, "Satellite and Decentralized Wastewater Treatment Systems", Environment and Engineering, Pp.: 176-184 (In Greek).
  57. A. Paleologou, H. Marakas, N.P. Xekoukoulotakis, A. Moya, Y. Vergara, N. Kalogerakis, P. Gikas and D. Mantzavinos, 2007, "Disinfection of Water and Wastewater by TiO2 Photocatalysis, Sonolysis and UV-C Irradiation", Catalysis Today, Vol.: 129, Pp.: 136-142, IF: 5.825. https://doi.org/10.1016/j.cattod.2007.06.059
  58. P. Gikas and A. G. Livingston, 2007, "Simulation of the Cellular Anabolic Activity within Biofilms: Where a New Immobilized Cell will Preferably Be Born?", Biochemical Engineering Journal, Vol.:35, Pp.: 29-36, IF: 3.475. https://doi.org/10.1016/j.bej.2006.12.018
  59. P. Gikas, 2007, "Kinetic Responses of Activated Sludge to Individual and Joint Nickel (Ni(II)) and Cobalt (Co(II)) – An Isobolographic Approach", Journal of Hazardous Materials, Vol.: 143, Pp.: 246-256, IF: 9.038. https://doi.org/10.1016/j.jhazmat.2006.09.019
  60. P. Gikas and P. Romanos, 2006, "Effects of Tri-valent (Cr(III)) and Hexa-valent (Cr(VI)) Chromium on the Growth of Activated Sludge", Journal of Hazardous Materials, Vol.: 133, Pp. 212-217, IF: 9.038 https://doi.org/10.1016/j.jhazmat.2005.10.023
  61. P. Gikas, 2006, "Water Reclamation and Reuse", Environment and Engineering, Pp.: 68-76 (In Greek).
  62. P. Gikas and A. G. Livingston, 2006, "Investigation of Biofilm Growth and Attrition in a Three Phase Air Lift Bioreactor Using 35S as a Radiolabelled Tracer", Journal of Chemical Technology and Biotechnology, Vol.: 81, Pp.: 858-865, IF: 2.750. https://doi.org/10.1002/jctb.1480
  63. P. Gikas and A. G. Livingston, 1999, "Steady State Behaviour of Three Phase Air Lift Bioreactors – An Integrated Model and Experimental Verification", Journal of Chemical Technology and Biotechnology, Vol.: 74, Pp.: 551-561, IF: 2.750. https://doi.org/10.1002/(SICI)1097-4660(199906)74:6<551::AID-JCTB72>3.0.CO;2-C
  64. P. Gikas and A. G. Livingston, 1998, "Use of ATP Concentration and Specific Oxygen Uptake Rate to Determine Parameters of a Structured Model of Biomass Growth", Enzyme and Microbial Technology, Vol: 22, Pp.: 500-510, IF: 3.448. https://doi.org/10.1016/S0141-0229(97)00242-1
  65. P. Gikas and A. G. Livingston, 1997, "Specific ATP and Specific Oxygen Uptake Rate in Immobilized Cell Aggregates: Experimental Results and Theoretical Analysis Using Structured Model of Immobilized Cell Growth", Biotechnology and Bioengineering, Vol:55, Pp. 660-673, IF: 4.002. https://doi.org/10.1002/(SICI)1097-0290(19970820)55:4<660::AID-BIT8>3.0.CO;2-F
  66. P. Gikas and A. G. Livingston, 1996, "Viability of Immobilized Cells: Use of Specific ATP levels and Oxygen Uptake Rates", Progress in Biotechnology, Vol: 11, Pp. 264-271. https://doi.org/10.1016/S0921-0423(96)80036-0
  67. P. Gikas and A. G. Livingston, 1993, "Specific ATP Concentrations in Freely Suspended and Immobilized Cells Degrading 3,4 Dichloroaniline", Progress in Biotechnology, Vol: 9, Part: 1, Pp. 489-492.
  68. P. Gikas and A. G. Livingston, 1993, "Use of ATP to Characterize Biomass Viability in Freely Suspended and Immobilized Cell Bioreactors", Biotechnology and Bioengineering, Vol: 42, Pp.: 1337-1351, IF: 4.002. https://doi.org/10.1002/bit.260421111
  69. G. Sakellaris and P. Gikas, 1991, "The Inductive Role of Casein on Proteinase Production from Lactobacilli", Biotechnology Letters, Vol: 13, Iss.:3, Pp.: 217-222, IF: 1.997. http://dx.doi.org/10.1007/bf01025821