@article{MZM_1973_14_3_a15,
     author = {G. I. Gusev},
     title = {On a~hypothesis on {Poincar\'e} series},
     journal = {Matemati\v{c}eskie zametki},
     pages = {453--463},
     publisher = {mathdoc},
     volume = {14},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_14_3_a15/}
}