“INFLUENCE OF THE NATURAL WOOD VARIABILITY ON THE HEAT TREATMENT PROCESS: EFFECTS OF THE WOOD INITIAL DENSITY ON THE FINAL QUALITY OF THE HEAT TREATED PRODUCT”. Innovation in Woodworking Industry and Engineering Design, vol. 2, no. 2, Jan. 2026, http://innojs.ltu.bg/index.php/scjournal-inno/article/view/95.