@article{DAN_1987_293_6_a0,
     author = {R. G. Airapetyan},
     title = {Construction of weakly commuting continuations of operators and the problem of the symmetrization of hyperbolic equations},
     journal = {Doklady Akademii Nauk},
     pages = {1289--1293},
     publisher = {mathdoc},
     volume = {293},
     number = {6},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_293_6_a0/}
}