TY JOUR TI THE RESOURCE SAVING PROBLEMS SAVING CONSIDERING SPECIFICS OF SEVERAL 2D PLACEMENT TASKS KW modeling KW optimization KW packing KW resource saving KW unification JO Modeling of systems and processes AU Kushcheva, I.S. AU Khukhryanskaya, E.S. PY 2021 IS 14 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov