@article{MZM_1991_49_4_a12,
     author = {V. S. Pilidi},
     title = {A~priori estimates for bisingular operators with continuous coefficients},
     journal = {Matemati\v{c}eskie zametki},
     pages = {105--109},
     year = {1991},
     volume = {49},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1991_49_4_a12/}
}