@article{DAN_1982_263_2_a15,
     author = {V. N. Bakulin and A. G. Protosenya},
     title = {On the presence of nonlinear effects in the propagation of elastic waves in rocks},
     journal = {Doklady Akademii Nauk},
     pages = {314--316},
     publisher = {mathdoc},
     volume = {263},
     number = {2},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1982_263_2_a15/}
}