“WOOD COLOUR MODIFICATION OF FRAXINUS EXCELSIOR L. DURING THE PROCESS OF THERMAL TREATMENT WITH SATURATED WATER STEAM”, INNO, vol. 7, no. 2, Jan. 2026, Accessed: Feb. 25, 2026. [Online]. Available: http://innojs.ltu.bg/index.php/scjournal-inno/article/view/226