@article{DAN_1969_188_2_a0,
     author = {S. K. Abdullaev and A. A.-o. Babaev},
     title = {Certain estimates for a singular integral with summable density},
     journal = {Doklady Akademii Nauk},
     pages = {263--265},
     publisher = {mathdoc},
     volume = {188},
     number = {2},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_188_2_a0/}
}