Abrahamsson L, 2015, IMPROVING METHANE PR; Agbor VB, 2011, BIOTECHNOL ADV, V29, P675, DOI 10.1016/j.biotechadv.2011.05.005; Amha YM, 2018, BIORESOURCE TECHNOL, V247, P999, DOI 10.1016/j.biortech.2017.08.210; Badshah M, 2012, BIORESOURCE TECHNOL, V114, P262, DOI 10.1016/j.biortech.2012.02.022; Batik AJ, 2018, ULTRASON SONOCHEM, V40, P383, DOI 10.1016/j.ultsonch.2017.07.029; Baxi PB, 2012, BIORESOURCE TECHNOL, V110, P697, DOI 10.1016/j.biortech.2012.01.042; BEUVINK JMW, 1993, J ANIM SCI, V71, P1041, DOI 10.2527/1993.7141041x; Bolado-Rodríguez S, 2016, BIORESOURCE TECHNOL, V201, P182, DOI 10.1016/j.biortech.2015.11.047; Carrier M, 2011, BIOMASS BIOENERG, V35, P298, DOI 10.1016/j.biombioe.2010.08.067; Channiwala SA, 2002, FUEL, V81, P1051, DOI 10.1016/S0016-2361(01)00131-4; Chen HZ, 2016, RENEW SUST ENERG REV, V57, P468, DOI 10.1016/j.rser.2015.12.069; Chen WH, 2010, INT J ENERG RES, V34, P265, DOI 10.1002/er.1566; Chen Y, 2008, BIORESOURCE TECHNOL, V99, P4044, DOI 10.1016/j.biortech.2007.01.057; Da Costa Gomez C., 2013, THE BIOGAS HDB; Martins LHD, 2015, BIORESOURCE TECHNOL, V191, P312, DOI 10.1016/j.biortech.2015.05.024; Du L, 2018, CATAL SCI TECHNOL, V8, P3216, DOI 10.1039/c8cy00533h; Franco RT, 2018, RENEW ENERG, V121, P315, DOI 10.1016/j.renene.2018.01.035; Garuti M, 2018, BIORESOURCE TECHNOL, V247, P599, DOI 10.1016/j.biortech.2017.09.100; Hamad MA, 2016, RENEW ENERG, V85, P1290, DOI 10.1016/j.renene.2015.07.082; Haque N, 2013, PROCEDIA ENGINEER, V56, P650, DOI 10.1016/j.proeng.2013.03.173; Hilares RT, 2017, BIORESOURCE TECHNOL, V235, P301, DOI 10.1016/j.biortech.2017.03.125; Himmel ME, 2007, SCIENCE, V315, P804, DOI 10.1126/science.1137016; Jagadabhi PS, 2019, ENVIRON TECHNOL, V40, P418, DOI 10.1080/09593330.2017.1393462; Janke L, 2015, INT J MOL SCI, V16, P20685, DOI 10.3390/ijms160920685; Jiang L, 2015, INT J HYDROGEN ENERG, V40, P15460, DOI 10.1016/j.ijhydene.2015.08.111; Karimi K, 2016, BIORESOURCE TECHNOL, V200, P1008, DOI 10.1016/j.biortech.2015.11.022; Kim I, 2015, BIORESOURCE TECHNOL, V192, P335, DOI 10.1016/j.biortech.2015.05.038; Kljun A, 2011, BIOMACROMOLECULES, V12, P4121, DOI 10.1021/bm201176m; Langone M, 2018, APPL BIOCHEM BIOTECH, V184, P1200, DOI 10.1007/s12010-017-2612-3; Lee I, 2013, ULTRASON SONOCHEM, V20, P1450, DOI 10.1016/j.ultsonch.2013.03.006; Li WZ, 2016, BIORESOURCES, V11, P5839, DOI 10.15376/biores.11.3.5839-5853; Liu B, 2016, ACS CATAL, V6, P326, DOI 10.1021/acscatal.5b02094; Luska KL, 2015, GREEN CHEM, V17, P3195, DOI 10.1039/c5gc00231a, 10.1039/C5GC00231A; Lyons G, 2018, J AGR FOOD CHEM, V66, P13031, DOI 10.1021/acs.jafc.8b03808; Madenoglu TG, 2016, J SUPERCRIT FLUID, V115, P79, DOI 10.1016/j.supflu.2016.04.017; Madison MJ, 2017, BIOMASS BIOENERG, V98, P135, DOI 10.1016/j.biombioe.2017.01.007; Mao CL, 2015, RENEW SUST ENERG REV, V45, P540, DOI 10.1016/j.rser.2015.02.032; Martín C, 2007, ENZYME MICROB TECH, V40, P426, DOI 10.1016/j.enzmictec.2006.07.015; Miao Z, 2011, IND CROP PROD, V33, P504, DOI 10.1016/j.indcrop.2010.12.016; Ministry of Agriculture \& Farmers Welfare, COOP FARM WELF ANN R; Munir S, 2009, BIORESOURCE TECHNOL, V100, P1413, DOI 10.1016/j.biortech.2008.07.065; Nakashima K, 2016, IND ENG CHEM RES, V55, P1866, DOI 10.1021/acs.iecr.5b04375; Neves PV, 2016, BIORESOURCE TECHNOL, V208, P184, DOI 10.1016/j.biortech.2016.02.085; Nielfa A, 2015, Biotechnol Rep (Amst), V5, P14, DOI 10.1016/j.btre.2014.10.005; Niemi P, 2017, IND CROP PROD, V98, P93, DOI 10.1016/j.indcrop.2017.01.022; Nizami AS, 2011, ENVIRON SCI TECHNOL, V45, P7561, DOI 10.1021/es201357r; Parsell T, 2015, GREEN CHEM, V17, P1492, DOI 10.1039/c4gc01911c; Patil PN, 2016, ULTRASON SONOCHEM, V30, P79, DOI 10.1016/j.ultsonch.2015.11.009; Paudel SR, 2017, BIORESOURCE TECHNOL, V245, P1194, DOI 10.1016/j.biortech.2017.08.182; Perrone OM, 2016, BIORESOURCE TECHNOL, V218, P69, DOI 10.1016/j.biortech.2016.06.072; Prapinagsorn W, 2017, ENERGIES, V10, DOI 10.3390/en10101654; Priecel P., 2018, SUSTAINABLE CATALYSI; Priyanto DE, 2018, ACS SUSTAIN CHEM ENG, V6, P2905, DOI 10.1021/acssuschemeng.7b04609; Rajoriya S, 2018, J HAZARD MATER, V344, P1109, DOI 10.1016/j.jhazmat.2017.12.005; Ranade V. V., 2016, US Patent, Patent No. 9422952, 9,422,952]; Rao PV, 2010, RENEW SUST ENERG REV, V14, P2086, DOI 10.1016/j.rser.2010.03.031; Rodriguez C, 2017, RENEW SUST ENERG REV, V68, P1193, DOI 10.1016/j.rser.2016.02.022; Saharan V. K., 2014, IND WASTEWATER TREAT; Sarvothaman VP, 2018, IND ENG CHEM RES, V57, P9292, DOI 10.1021/acs.iecr.8b01688; Sawatdeenarunat C, 2015, BIORESOURCE TECHNOL, V178, P178, DOI 10.1016/j.biortech.2014.09.103; Schwarz D, 2016, BIORESOURCE TECHNOL, V216, P462, DOI 10.1016/j.biortech.2016.05.092; Silverstein R. A., 2004, COMP CHEM PRETREATME; Singh R, 2016, RENEW ENERG, V98, P226, DOI 10.1016/j.renene.2016.03.023; Siqueira G, 2017, BIOTECHNOL BIOFUELS, V10, DOI 10.1186/s13068-017-0860-7; Sivakumar M, 2002, ULTRASON SONOCHEM, V9, P123, DOI 10.1016/S1350-4177(01)00122-5; Strömberg S, 2014, WASTE MANAGE, V34, P1939, DOI 10.1016/j.wasman.2014.07.018; Strömberg S, 2015, BIORESOURCE TECHNOL, V176, P233, DOI 10.1016/j.biortech.2014.11.033; Sun Y, 2002, BIORESOURCE TECHNOL, V83, P1, DOI 10.1016/S0960-8524(01)00212-7; Surendra K.C., 2015, IND BIOTECHNOL, V11, P103, DOI 10.1089/ind.2015.0001; Suryawanshi PG, 2018, ENVIRON PROG SUSTAIN, V37, P295, DOI 10.1002/ep.12674; Thamsiriroj T, 2012, APPL ENERG, V95, P64, DOI 10.1016/j.apenergy.2012.02.008; Thomsen ST, 2014, BIORESOURCE TECHNOL, V154, P80, DOI 10.1016/j.biortech.2013.12.029; Wall DM, 2013, BIORESOURCE TECHNOL, V149, P425, DOI 10.1016/j.biortech.2013.09.094; Wiselogel A., 1996, HDB BIOETHANOL PRODU, P105; Xie S, 2011, BIORESOURCE TECHNOL, V102, P8748, DOI 10.1016/j.biortech.2011.07.078; Yang HP, 2007, FUEL, V86, P1781, DOI 10.1016/j.fuel.2006.12.013; Yang LC, 2015, RENEW SUST ENERG REV, V44, P824, DOI 10.1016/j.rser.2015.01.002; Zielinski M, 2019, ENERGIES, V12, DOI 10.3390/en12030526; Zielinski M, 2019, WASTE BIOMASS VALORI, V10, P747, DOI 10.1007/s12649-017-9977-y; Zonoozi MH, 2017, ENVIRON PROG SUSTAIN, V36, P1785, DOI 10.1002/ep.12651