@article{MZM_1978_24_6_a7,
     author = {A. I. Perov},
     title = {Potential operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {793--799},
     publisher = {mathdoc},
     volume = {24},
     number = {6},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1978_24_6_a7/}
}