@article{DE_1967_3_1_a6,
     author = {N. E. Tovmasyan},
     title = {On the theory of singular integral equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {69--80},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_1_a6/}
}