@article{IVM_1971_1_a2,
     author = {F. A. Vichmann},
     title = {The convergence of infinite products},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {21--25},
     year = {1971},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1971_1_a2/}
}