Gajić, Boško, Jordan Milivojević, and Nevenka Đurović. “SOIL QUALITY MONITORING FOR SUSTAINABLE AGRICULTURE”. Economic of Agriculture 53, no. 3 (September 30, 2006): 893–902. Accessed January 12, 2026. https://www.ea.bg.ac.rs/index.php/EA/article/view/1476.