Mihajlova, Julia, and Viktor Savov. (2026) 2023. “SUNFLOWER STALKS AND LIGNOSULFONATE – ALTERNATIVE RAW MATERIALS FOR THE PRODUCTION OF ECO-FRIENDLY MEDIUM DENSITY FIBREBOARDS”. Innovation in Woodworking Industry and Engineering Design 12 (1). https://doi.org/10.66211/inno.2023.1.355.