@article{DAN_1977_237_6_a9,
     author = {V. N. Semenyuta},
     title = {On singular operator equations with shift on a circle},
     journal = {Doklady Akademii Nauk},
     pages = {1301--1302},
     publisher = {mathdoc},
     volume = {237},
     number = {6},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_237_6_a9/}
}