@article{DAN_1980_252_2_a10,
     author = {L. P. Kuptsov},
     title = {On parabolic means},
     journal = {Doklady Akademii Nauk},
     pages = {296--301},
     publisher = {mathdoc},
     volume = {252},
     number = {2},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_252_2_a10/}
}