@article{MZM_1981_30_5_a15,
     author = {N. K. Karapetyants},
     title = {Necessary conditions for the boundedness of an operator with nonnegative quasihomogeneous kernel},
     journal = {Matemati\v{c}eskie zametki},
     pages = {787--794},
     publisher = {mathdoc},
     volume = {30},
     number = {5},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1981_30_5_a15/}
}