@article{DAN_1973_208_4_a4,
     author = {R. S. Levitin and T. L. Perel'man and I. V. Travnitskaya},
     title = {On a limiting condition of a class of integro-differential equations with a nonintegrable kernel},
     journal = {Doklady Akademii Nauk},
     pages = {775--778},
     publisher = {mathdoc},
     volume = {208},
     number = {4},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_208_4_a4/}
}