@article{DAN_1966_167_5_a2,
     author = {Z. O. Mel'nik},
     title = {Multidimensional hyperbolic equations of an arbitrary order with discontinuous coefficients},
     journal = {Doklady Akademii Nauk},
     pages = {974--977},
     publisher = {mathdoc},
     volume = {167},
     number = {5},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_167_5_a2/}
}