TY - JOUR AU - F. Kh. Mukminov TI - On straightening the characteristics of a~quasilinear second-order equation JO - Teoretičeskaâ i matematičeskaâ fizika PY - 1988 SP - 18 EP - 25 VL - 75 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TMF_1988_75_1_a1/ LA - ru ID - TMF_1988_75_1_a1 ER -