@article{TM_1987_176_a12,
     author = {A. F. Leont'ev},
     title = {Series and sequences of polynomials of exponentials},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {308--325},
     year = {1987},
     volume = {176},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1987_176_a12/}
}