Sakiewicz, P., Cebula, J., Piotrowski, K., & Bohdziewicz, J. (2019). Methane fermentation of poultry manure — shortcomings and advantages of the technology: fermentation or co-fermentation?. Eco-Energetics: Technologies, Environment, Law and Economy, 2, 97–104. https://doi.org/10.24426/eco-energetics.v2i2.114