@article{MZM_1991_50_5_a8,
     author = {E. E. Petrov},
     title = {Cavalieri conditions for a $k$-dimensional radon transformation},
     journal = {Matemati\v{c}eskie zametki},
     pages = {61--68},
     year = {1991},
     volume = {50},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1991_50_5_a8/}
}