@article{DAN_1997_354_5_a0,
     author = {I. M. Gel'fand and M. I. Graev},
     title = {$GG$-functions of several variables and their connection with},
     journal = {Doklady Akademii Nauk},
     pages = {583--586},
     year = {1997},
     volume = {354},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1997_354_5_a0/}
}