@article{RM_1960_15_2_a15,
     author = {A. G. Kostyuchenko and G. I. \`Eskin},
     title = {Sobolev--Gal'pern equations},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1960_15_2_a15/}
}