@article{DAN_1967_177_5_a2,
     author = {A. G. Dragalin},
     title = {On the basis for {A.\,A.~Markov's} constructive selection principle},
     journal = {Doklady Akademii Nauk},
     pages = {997--1000},
     publisher = {mathdoc},
     volume = {177},
     number = {5},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_177_5_a2/}
}