Rugele, K. , Gavare, M. , Grube, M. , Tihomirova, K. , Skripsts, E. , Larsson, S. , Rubulis, J. (2013). 'Characterization of Lactose Consumption during the Biogas Production from Acid Whey by FT-IR Spectroscopy'. World Academy of Science, Engineering and Technology, Open Science Index 77, International Journal of Chemical and Molecular Engineering, 7(5), 257 - 261.