@article{DAN_1989_304_2_a3,
     author = {Yu. I. Karlovich},
     title = {Algebras of singular integral operators with discrete groups of},
     journal = {Doklady Akademii Nauk},
     pages = {274--280},
     year = {1989},
     volume = {304},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_304_2_a3/}
}