Estevez, M., R. Tomczak-Wandzel, K. Akervold, i O. Tornes. Co-Digestion of Waste from the Salmon Aquaculture Sector With Regional Sewage Sludge: Effects on Methane Yield and Digestate Nutrient Content. Eco-Energetics: Technologies, Environment, Law and Economy, T. 2, June 2019, s. 29-34, doi:10.24426/eco-energetics.v2i2.107.