@article{IVM_1967_2_a2,
     author = {I. I. Volkov},
     title = {Summation of unbounded sequences},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {20--25},
     year = {1967},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1967_2_a2/}
}