Marinov K, Peev D. REGRESSION MODELS FOR DETERMINING THE OPERATING COSTS OF FORESTRY MILLING MACHINES FOR COMPLETE SOIL PREPARATION FOR REFORESTATION OF POPLAR CLEARINGS. INNO. 2026;13(1). Accessed April 14, 2026. http://innojs.ltu.bg/index.php/scjournal-inno/article/view/303