@article{SM_1994_77_1_a5,
     author = {N. M. Kasumov},
     title = {Calder\'on--Zygmund theory for kernels with nondiscrete sets of singularities},
     journal = {Sbornik. Mathematics},
     pages = {77--91},
     publisher = {mathdoc},
     volume = {77},
     number = {1},
     year = {1994},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1994_77_1_a5/}
}