TY - JOUR AU - R. G. Airapetyan TI - Construction of weakly commuting continuations of operators and the problem of the symmetrization of hyperbolic equations JO - Doklady Akademii Nauk PY - 1987 SP - 1289 EP - 1293 VL - 293 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1987_293_6_a0/ LA - ru ID - DAN_1987_293_6_a0 ER -