@article{DAN_1975_220_1_a14,
     author = {B. A. Levitskii and V. M. Mostepanenko and V. M. Frolov},
     title = {Properties of the basis functions of expansions which are invariant under the group $O(4)$},
     journal = {Doklady Akademii Nauk},
     pages = {61--64},
     publisher = {mathdoc},
     volume = {220},
     number = {1},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_220_1_a14/}
}