@article{IM2_1971_5_4_a11,
     author = {I. Ts. Gokhberg and N. Ya. Krupnik},
     title = {Singular integral operators with piecewise continuous coefficients and their symbols},
     journal = {Izvestiya. Mathematics },
     pages = {955--979},
     publisher = {mathdoc},
     volume = {5},
     number = {4},
     year = {1971},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1971_5_4_a11/}
}