Genchev, Yancho, Teodor Lulchev, and Desislava Hristodorova. (2026) 2016. “INFLUENCE OF THE TYPE OF UPHOLSTERY MATERIALS ON THE SOFTNESS OF UPHOLSTERY WITH INNER SPRING UNITS”. Innovation in Woodworking Industry and Engineering Design 5 (1). http://innojs.ltu.bg/index.php/scjournal-inno/article/view/203.