@article{PDM_2012_1_a3,
     author = {D. V. Kruchinin},
     title = {Properties of coefficients in some superpositions of generating functions},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {55--59},
     publisher = {mathdoc},
     number = {1},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2012_1_a3/}
}