@article{DAN_1968_182_2_a15,
     author = {P. E. Krasnushkin and R. B. Baibulatov},
     title = {Evaluation of the wave numbers of normal waves in spherically-stratified media by the method of impedance transform},
     journal = {Doklady Akademii Nauk},
     pages = {294--297},
     publisher = {mathdoc},
     volume = {182},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_182_2_a15/}
}