Ofverstrom, Svetlana, Ieva Sapkaitė, and Regimantas Dauknys. 2010. “The Impact of Chemical Phosphorus Removal on the Process of Anaerobic Sludge Digestion”. Mokslas – Lietuvos Ateitis / Science – Future of Lithuania 2 (5):71-74. https://doi.org/10.3846/mla.2010.094.