L. Karaoglanoglou, D. Koullas, L. Diamantopoulou, I. Panagiotopoulos, S. Papadaki, and E. Koukios, “Best Practices for Small-scale Biomass Based Energy Applications in EU-27: The Case of Fermentative Biohydrogen Generation Technology”, Chemical Engineering Transactions, vol. 29, pp. 1117-1122, Sep. 2012.