“STRUCTURE AND PROPERTIES OF FIR (ABIES BORISII – REGIS MATTF.) AND SPRUCE (PICEA EXCELSA LINK) AND THEIR INFLUENCE ON WOΟD IMPREGNABILITY*”. 2026. Innovation in Woodworking Industry and Engineering Design 3 (2). http://innojs.ltu.bg/index.php/scjournal-inno/article/view/178.