Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1978_24_1_a6, author = {V. A. Belyaev}, title = {Grouped power series}, journal = {Matemati\v{c}eskie zametki}, pages = {53--62}, publisher = {mathdoc}, volume = {24}, number = {1}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1978_24_1_a6/} }
V. A. Belyaev. Grouped power series. Matematičeskie zametki, Tome 24 (1978) no. 1, pp. 53-62. http://geodesic.mathdoc.fr/item/MZM_1978_24_1_a6/