@article{DAN_1980_252_2_a20,
     author = {P. E. Krasnushkin},
     title = {Method of calculation of impedance in problems of waves in elastic media},
     journal = {Doklady Akademii Nauk},
     pages = {332--335},
     publisher = {mathdoc},
     volume = {252},
     number = {2},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_252_2_a20/}
}