@article{DAN_1973_209_6_a0,
     author = {A. A.-o. Babaev and V. V. Salaev},
     title = {A one-dimensional singular operator with continuous density along a closed curve},
     journal = {Doklady Akademii Nauk},
     pages = {1257--1260},
     publisher = {mathdoc},
     volume = {209},
     number = {6},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_209_6_a0/}
}