Valchev, Ivo, Yvailo Yordanov, Viktor Savov, and Petar Antov. 2022. “Optimization of the Hot-Pressing Regime in the Production of Eco-Friendly Fibreboards Bonded With Hydrolysis Lignin”. Periodica Polytechnica Chemical Engineering 66 (1):125-34. https://doi.org/10.3311/PPch.18284.