@article{DAN_1997_354_2_a1,
     author = {I. M. Gel'fand and M. I. Graev},
     title = {$GG$-functions of one variable},
     journal = {Doklady Akademii Nauk},
     pages = {155--158},
     publisher = {mathdoc},
     volume = {354},
     number = {2},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1997_354_2_a1/}
}