Kolodynskij, Vitalij, and Pranas Baltrėnas. “Biogas Production Experimental Research by Using Sewage Sludge Loading With Biochar Additive”. Mokslas – Lietuvos ateitis / Science – Future of Lithuania 9, no. 4 (September 11, 2017): 371-375. Accessed December 29, 2024. https://mma.vgtu.lt/index.php/MLA/article/view/465.