Genchev, Y., Lulchev, T. and Hristodorova, D. (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). Available at: http://innojs.ltu.bg/index.php/scjournal-inno/article/view/203 (Accessed: 14 April 2026).