1. G. Vardar-Schara et al., Microb. Biotechnol. 1 (2008) 107-125.

2. S. Mirzoyan et al., International Journal of Hydrogen Energy 45(35) (2020) 17233-17240.

3. K. Trchounian, A. Trchounian, Int. J. Hydrogen Energy 34 (2009) 8839-8845.

4. M.Z. Mohd Yusoff et al., Int.J.Hydrogen Energy 37(2012) 17778-17787.

5. R. Lin et al., Energy Convers. Manag. 151(Supplement C) (2017) 553-561.

6. R. Lin et al., Energy Convers. Manag. 158 (2018) 201-209.

7. D.B. Levin et al., Int. J. Hydrogen Energy 29 (2004) 173-85.

8. S. Manish, R. Banerjee, Int. J. Hydrogen Energy 33 (2008) 279-86.

9. P.C. Hallenbeck et al., Bioresour. Technol. 110 (2012) 1-9.

10. P. Karthic, J. Shiny, Int. J. Adv. Eng. Technol. 2 (2012) 342-356.

11. K. Bru et al., Int. J. Hydrogen Energy 37 (2012) 14062-14071.

12. C. Li, H.H.P. Fang, Crit. Rev. Environ. Sci. Technol. 37 (2007) 1-39.

13. I. Valdez-Vazquez, H.M. Poggi-Varaldo, Renew. Sustain. Energy. Rev. 13 (2009) 1000-1013.

14. N.M.C. Saady, Int. J. Hydrogen Energy 38 (2013) 13172-13191.

15. Y.M. Wong et al., Renew. Sustain. Energy. Rev. 34 (2014) 471-482.

16. Y. Sun, J. Cheng, Bioresour. Technol. 83 (2002) 1-11.

17. Y. Zheng et al., Int. J. Agric. Biol. Eng. 2 (2009) 51-68.

18. N. Mosier et al., Bioresour. Techn. 96 (2005) 673-686.

19. E. Elbeshbishy et al., Int. J. Hydrogen Energy 36 (2011) 11379-11387.

20. E. Palmqvist, B. Hahn-Hagerdal, Bioresour. Technol. 74 (2000) 17-24.

21. E. Palmqvist, B. Hahn-Hagerdal, Bioresour. Technol. 74 (2000) 25-33.

22. R. Chen et al., BMB Rep. 46 (2013) 244-251.

23. S. Behera et al., Renew. Sustain. Energy Rev. 36 (2014) 91-106.

24. G. Kumar et al., Ren. Sust. Energy. Rev. 44 (2015) 728-737.

25. J.R.M. Almeida et al., Appl. Micr. Biot. 82 (2009) 625-638.

26. L.J. Jonsson et al., Biotech.Biofuels 6 (2013) 1-10.

27. F. Monlau et al., Biotechnol. Adv. 32 (2014) 934-951.