@article{DAN_1991_318_4_a27,
     author = {A. G. Voronovich},
     title = {Sound field eigenmodes for horizontally-nonhomogeneous waveguides},
     journal = {Doklady Akademii Nauk},
     pages = {887--892},
     publisher = {mathdoc},
     volume = {318},
     number = {4},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_318_4_a27/}
}