@article{DAN_1993_333_5_a1,
     author = {I. M. Gel'fand and M. I. Graev and V. S. Retakh},
     title = {$(R,S)$-hypergeometric functions of one variable},
     journal = {Doklady Akademii Nauk},
     pages = {567--570},
     publisher = {mathdoc},
     volume = {333},
     number = {5},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_333_5_a1/}
}