@article{AA_2010_22_1_a4,
     author = {V. M. Babich},
     title = {A class of topographical waveguides},
     journal = {Algebra i analiz},
     pages = {98--107},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2010_22_1_a4/}
}