TY - JOUR AU - V. N. Shchelkachev TI - Singularities of mathematical solutions of problems connected with the investigation of one-dimensional flows in multidimensional spaces JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1989 SP - 19 EP - 26 VL - 186 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TM_1989_186_a4/ LA - ru ID - TM_1989_186_a4 ER -