@article{IIGUM_2012_5_3_a4,
     author = {V. P. Krivokolesko and E. K. Leinartas},
     title = {On identities with polynomial coefficients},
     journal = {The Bulletin of Irkutsk State University. Series Mathematics},
     pages = {56--62},
     publisher = {mathdoc},
     volume = {5},
     number = {3},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIGUM_2012_5_3_a4/}
}