TY - JOUR AU - M. I. Khaikin TI - The exceptional case of the Riemann problem JO - Trudy seminara po kraevym zadačam PY - 1970 SP - 283 EP - 288 VL - 7 IS - 7 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/KUKZ_1970_7_7_a43/ LA - ru ID - KUKZ_1970_7_7_a43 ER -