@article{DE_1993_29_9_a4,
     author = {N. E. Ershov and S. I. Smagin},
     title = {Solution of three-dimensional problems of acoustics and elasticity by the method of potentials},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1517--1525},
     publisher = {mathdoc},
     volume = {29},
     number = {9},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1993_29_9_a4/}
}