@article{DAN_1970_191_1_a1,
     author = {I. Ts. Gokhberg and N. Ya. Krupnik},
     title = {The symbols of one-dimensional singular integral operators on an open contour},
     journal = {Doklady Akademii Nauk},
     pages = {12--15},
     publisher = {mathdoc},
     volume = {191},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_191_1_a1/}
}