@article{DAN_1967_172_1_a2,
     author = {M. Ya. Zinger},
     title = {Generalization of a problem of {Schaeffer{\textendash}Duffin} to finite functionals},
     journal = {Doklady Akademii Nauk},
     pages = {14--17},
     year = {1967},
     volume = {172},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_172_1_a2/}
}