@article{GMJ_1995__2_3_47277,
     author = {Jaiani, G.},
     title = {On a generalization of the {Keldysh} theorem.},
     journal = {Georgian mathematical journal},
     pages = {291--297},
     year = {1995},
     volume = {2},
     number = {3},
     zbl = {0824.35039},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/GMJ_1995__2_3_47277/}
}