@article{DAN_1979_247_4_a11,
     author = {A. A. Lokshin},
     title = {Fundamental solutions of wave operators with retarded time. {New} asymptotic formulas},
     journal = {Doklady Akademii Nauk},
     pages = {812--814},
     publisher = {mathdoc},
     volume = {247},
     number = {4},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_247_4_a11/}
}