@article{DE_1984_20_4_a11,
     author = {N. G. Marchuk},
     title = {Reduction of the {Cauchy} problem for the wave equation to the {Cauchy} problem for a system of first-order equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {653--659},
     publisher = {mathdoc},
     volume = {20},
     number = {4},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_4_a11/}
}