Possibilities for obtaining pellets by single-screw extrusion of biomass from black pine (Pinus nigra Arn.)Apostol Simitchiev, Bozidar Bozadzhiev, Lazar Lazarov, Stanko Stankov, Hafize Fidan and Albena StoyanovaE3S Web Conf., 327 (2021) 02010DOI: https://doi.org/10.1051/e3sconf/202132702010