@article{DAN_1995_342_3_a3,
     author = {S. M. Grudskii},
     title = {Toeplitz operators with symbols that have discontinuities of},
     journal = {Doklady Akademii Nauk},
     pages = {307--309},
     publisher = {mathdoc},
     volume = {342},
     number = {3},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1995_342_3_a3/}
}