Pečkytė, Julija, and Edita Baltrėnaitė. 2015. “Assessment of Heavy Metals Leaching from (bio)char Obtained from Industrial Sewage Sludge”. Mokslas – Lietuvos Ateitis / Science – Future of Lithuania 7 (4):399-406. https://doi.org/10.3846/mla.2015.811.