Ружинська, Л.І. and Фоменкова, А.О. 2012. Mathematical model of biogas bubblesgrowth in bioreactor with fixed film. Eastern-European Journal of Enterprise Technologies. 1, 8(55) (Feb. 2012), 53–56. DOI:https://doi.org/10.15587/1729-4061.2012.3431.