@article{DAN_1990_315_3_a12,
     author = {S. G. Pshenichnov},
     title = {Propagation of one-dimensional waves in piecewise-homogeneous},
     journal = {Doklady Akademii Nauk},
     pages = {566--570},
     publisher = {mathdoc},
     volume = {315},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_315_3_a12/}
}