@article{DAN_1991_316_5_a11,
     author = {A. V. Generalov},
     title = {Some integral relations for acoustic waves in a nonhomogeneous},
     journal = {Doklady Akademii Nauk},
     pages = {1072--1076},
     year = {1991},
     volume = {316},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_316_5_a11/}
}