Open Access
Review

Table 2

Biohydrogen production via photo-fermentation' bibliographic results.

Years Science Direct Scopus Published papers
2009 17 4 21
2010 24 18 42
2011 45 18 63
2012 41 22 63
2013 45 16 61
2014 29 11 40
2015 37 20 57
2016 44 16 60
2017 39 18 57
2018 54 15 69
2019 80 17 97
2020 86 27 113
Total number 541 202 743

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