A. Ghimire, L. Frunzo, E. Salzano, A. Panico, G. Esposito, P. Lens, F. Pirozzi, Biomass Enrichment and Scale-up Implications for Dark Fermentation Hydrogen Production with Mixed Cultures, Chemical Engineering Transactions. 43 (2015) 391-396. doi:10.3303/CET1543066.