@article{MZM_1982_31_1_a5,
     author = {V. S. Pilidi},
     title = {Necessary conditions for characteristic bisingular integral operators with measurable coefficients to be fredholm},
     journal = {Matemati\v{c}eskie zametki},
     pages = {53--59},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1982_31_1_a5/}
}