%0 Journal Article %T Two-Echelon Transportation Problem and Transshipment Nodes in Forest Industry Production: An Optimization Model %A Rogulin, R.S. %K multi-level transportation system; MILP model; freight routing; graph-based infrastructure model; forest resources logistics %J Forestry Engineering Journal %D 2026 %N 16 %P 17 %I FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov