Trichkov, Neno, Daniel Koynov, and Cvetelin Ranov. “QUALITY CHARACTERISTICS OF DOUGLAS FIR STEMS (Pseudotsuga Menziesii) FOR THE PRODUCTION OF MASSIVE WOOD MATERIALS”. Innovation in Woodworking Industry and Engineering design 7, no. 1 (May 20, 2018). Accessed July 26, 2026. https://innojs.ltu.bg/index.php/scjournal-inno/article/view/223.