TY JOUR TI Mathematical Modeling of the Spread of Pollutants in a Closed Water Area KW boundary value problems of mathematical physics KW mathematical modeling KW diffusing substance KW diffusion equation KW pollution spot KW polluting area KW closed water area JO Intellectual Technologies on Transport AU Bestuzheva, A.N. AU Goncharenko, V.A. PY 2023 IS 0 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"