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Rugele, K. , Gavare, M. , Grube, M. , Tihomirova, K. , Skripsts, E. , Larsson, S. , Rubulis, J.. "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, (2013), 7(5), 257 - 261.