@article{DAN_1994_336_6_a1,
     author = {I. M. Gel'fand and M. I. Graev and V. S. Retakh and S. A. Spirin},
     title = {$(r,s)$-exponentials},
     journal = {Doklady Akademii Nauk},
     pages = {730--732},
     publisher = {mathdoc},
     volume = {336},
     number = {6},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1994_336_6_a1/}
}