“DATA ENVELOPMENT ANALYSIS OF FACTORS FOR FOREST INDUSTRY WAGES AND SALARIES LEVELS IN NUTS 2 REGIONS OF BULGARIA”. Innovation in Woodworking Industry and Engineering design 12, no. 1 (January 30, 2026). Accessed February 25, 2026. http://innojs.ltu.bg/index.php/scjournal-inno/article/view/350.