@article{DAN_1978_240_1_a9,
     author = {A. A. Lokshin},
     title = {Wave equations with singular lag time},
     journal = {Doklady Akademii Nauk},
     pages = {43--46},
     publisher = {mathdoc},
     volume = {240},
     number = {1},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_240_1_a9/}
}