@article{VMUMM_1993_4_a20,
     author = {Yu. A. Kaz'min},
     title = {On a property of power series},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {85--87},
     year = {1993},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1993_4_a20/}
}