Annimari Lehtomäki, "Biogas production from energy crops and residues" [*.pdf], Jyväskylä studies in Biological an In Environmental Science, PhD thesis, Jyväskylä University, Finland, 2006.
Annimari Lehtomäki, "Biogas production from energy crops and residues" [*.pdf], Jyväskylä Studies in Biological and Environmental Science, PhD thesis, Jyväskylä University, Finland, 2006.