@article{DAN_1970_193_6_a2,
     author = {I. I. Ibragimov and A. D. Gadzhiev},
     title = {On a sequence of linear positive operators},
     journal = {Doklady Akademii Nauk},
     pages = {1222--1225},
     year = {1970},
     volume = {193},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_193_6_a2/}
}