[1]   H. Roubík, J. Mazancová, P. Le Dinh, D. Dinh Van, and J. Banout, “Biogas quality across small-scale biogas plants: A case of central vietnam,” Energies, 2018, doi: 10.3390/en11071794.

[2]   Q. Sun, H. Li, J. Yan, L. Liu, Z. Yu, and X. Yu, “Selection of appropriate biogas upgrading technology-a review of biogas cleaning, upgrading and utilisation,” Renewable and Sustainable              Energy Reviews. 2015, doi: 10.1016/j.rser.2015.06.029.

[3]   O. W. Awe, Y. Zhao, A. Nzihou, D. P. Minh, and N. Lyczko, “A Review of Biogas Utilisation, Purification and Upgrading Technologies,” Waste and Biomass Valorization. 2017, doi:                      10.1007/s12649-016-9826-4.

[4]   N. Scarlat, F. Fahl, J. F. Dallemand, F. Monforti, and V. Motola, “A spatial analysis of biogas potential from manure in Europe,” Renew. Sustain. Energy Rev., 2018, doi:                                          10.1016/j.rser.2018.06.035.

[5]   N. Scarlat, J. F. Dallemand, and F. Fahl, “Biogas: Developments and perspectives in Europe,” Renewable Energy. 2018, doi: 10.1016/j.renene.2018.03.006.

[6]   F. R. H. Abdeen, M. Mel, M. S. Jami, S. I. Ihsan, and A. F. Ismail, “A review of chemical absorption of carbon dioxide for biogas upgrading,” Chinese Journal of Chemical Engineering.                 2016, doi: 10.1016/j.cjche.2016.05.006.

[7]   I. Angelidaki et al., “Biogas upgrading and utilization: Current status and perspectives,” Biotechnology Advances. 2018, doi: 10.1016/j.biotechadv.2018.01.011.

[8]   S. Achinas, V. Achinas, and G. J. W. Euverink, “A Technological Overview of Biogas Production from Biowaste,” Engineering, 2017, doi: 10.1016/J.ENG.2017.03.002.

[9]   V. Kadasala, N. S. Ghosh, S. K. Chinnaiyan, A. Mallik, S. Y. Manjunath, and C. Bhattacharjee, “Phytochemical and pharmacological evaluation of annona reticulate,” Res. J. Pharm.                        Technol., 2021, doi: 10.52711/0974-360X.2021.00848.

[10] K. J. Hirani, “Biochemical Characterization and Probiotic Potential of Lactic Acid Bacteria Isolated from Camel Milk,” Biosci. Biotechnol. Res. Commun., 2021, doi: 10.21786/bbrc/14.1/28.

[11] Y. S. Duksh, B. K. Kaushik, S. Sarkar, and R. Singh, “Performance comparison of carbon nanotube, nickel silicide nanowire and copper VLSI interconnects: Perspectives and challenges                ahead,” J. Eng. Des. Technol., 2010, doi: 10.1108/17260531011086199.

[12] W. Jun et al., “Does globalization matter for environmental degradation? Nexus among energy consumption, economic growth, and carbon dioxide emission,” Energy Policy, 2021, doi:                  10.1016/j.enpol.2021.112230.

[13] I. Ullah Khan et al., “Biogas as a renewable energy fuel – A review of biogas upgrading, utilisation and storage,” Energy Conversion and Management. 2017, doi:                                                      10.1016/j.enconman.2017.08.035.

[14] S. Mittal, E. O. Ahlgren, and P. R. Shukla, “Barriers to biogas dissemination in India: A review,” Energy Policy, 2018, doi: 10.1016/j.enpol.2017.10.027.

[15] A. Rawat, M. A. Nasser, R. Khan, and H. Nautiyal, “Pharmacological and Toxicological evaluation of selenium in combination with thiamine in chemically induced hepatocarcinogenesis,”           Res. J. Chem. Environ., 2021, doi: 10.25303/259rjce96102.

[16] H. Kumar, A. K. Sarma, and P. Kumar, “Experimental investigation of 2-EHN effects upon CI engine attributes fuelled with used cooking oil-based hybrid microemulsion biofuel,” Int. J.                Environ. Sci. Technol., 2021, doi: 10.1007/s13762-021-03751-y.

[17] N. Jahan, R. Khatoon, and S. Ahmad, “In vitro evaluation of antibacterial potential of Stevia rebaudiana Bertoni against various bacterial pathogens including resistant isolates with bla                    genes,” Med. Plants, 2014, doi: 10.5958/0975-6892.2014.00479.1.

[18] S. Kumar, V. J. Kumar, and R. Singh, “Physico-chemical analysis and preliminary phytochemical screening of crude plant extracts of eclipta alba in district haridwar,” Rasayan J. Chem.,                2020, doi: 10.31788/RJC.2020.1335911.

[19] L. Tripathi and R. Singh, “Anticonvulsant and neurotoxicity evaluation of some novel cyclohexyl-[4-substituted benzylidene/2-oxo-1,2-dihydro-indol-3-ylidene] thiosemicarbazides,” Asian          J. Chem., 2011.

[20] Harminder, V. Singh, and A. K. Chaudhary, “A Review on the taxonomy, ethnobotany, chemistry and pharmacology of Oroxylum indicum vent,” Indian Journal of Pharmaceutical Sciences.          2011, doi: 10.4103/0250-474X.98981.

[21] A. Kumar, R. K. Jain, P. Yadav, R. N. Chakraborty, B. K. Singh, and B. K. Nayak, “Effect of gamma irradiation on the etching properties of Lexan and Makrofol-DE polycarbonate plastics,”         J. Radioanal. Nucl. Chem., 2013, doi: 10.1007/s10967-012-1830-y.

[22] R. Singh, M. Maithani, S. K. Saraf, S. Saraf, and R. C. Gupta, “Simultaneous Estimation of Ciprofloxacin Hydrochloride, Ofloxacin, Tinidazole and Ornidazole by Reverse Phase – High                Performance Liquid Chromatography,” Eurasian Journal of Analytical Chemistry. 2009.

[23] S. Kumar, A. K. Wahi, and R. Singh, “Synthesis, computational studies and preliminary pharmacological evaluation of 2-[4-(aryl substituted) piperazin-1-yl] N, N-diphenylacetamides as                potential antipsychotics,” Eur. J. Med. Chem., 2011, doi: 10.1016/j.ejmech.2011.07.028.

[24] L. Tripathi, R. Singh, and J. P. Stables, “Design & synthesis of N′-[substituted] pyridine-4-carbohydrazides as potential anticonvulsant agents,” Eur. J. Med. Chem., 2011, doi:                                  10.1016/j.ejmech.2010.11.030.

[25] P. Chawla, S. Kalra, R. Kumar, R. Singh, and S. K. Saraf, “Novel 2-(substituted phenyl Imino)-5-benzylidene-4-thiazolidinones as possible non-ulcerogenic tri-action drug candidates:                     synthesis, characterization, biological evaluation And docking studies,” Med. Chem. Res., 2019, doi: 10.1007/s00044-018-02288-z.

[26] C. The Phan et al., “Controlling environmental pollution: dynamic role of fiscal decentralization in CO2 emission in Asian economies,” Environ. Sci. Pollut. Res., 2021, doi:                                    10.1007/s11356-021-15256-9.