«Off road transportation cost calculations for ground based forest harvesting systems», Math. Comput. For. Nat. Res. Sci., т. 6, вып. 2, сс. 48–53 (6), сен. 2014, просмотрено: сен. 09, 2026. доступно на: https://tmp.mcfns.com/index.php/Journal/article/view/6_48