@article{MZM_1996_59_5_a2,
     author = {V. V. Volchkov},
     title = {Extremal cases of the {Pompeiu} problem},
     journal = {Matemati\v{c}eskie zametki},
     pages = {671--680},
     publisher = {mathdoc},
     volume = {59},
     number = {5},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1996_59_5_a2/}
}