TY JOUR TI MATHEMATICAL MODELLING OF OIL POLLUTION OF THE SURFACE OF THE WATER KW oil KW extraordinary situations KW modeling KW diffusion KW Euler-Cauchy's method JO Scientific and analytical journal «Vestnik Saint-Petersburg university of State fire service of EMERCOM of Russia» AU Kalach, A.V. AU Shcerbakov, O.V. PY 2013 IS 2013 PB Saint-Petersburg University of State Fire Service of Emercom of Russia