@article{DAN_1964_157_5_a25,
     author = {A. V. Nikolaev},
     title = {Diagrams and series of separation in extraction},
     journal = {Doklady Akademii Nauk},
     pages = {1156--1159},
     publisher = {mathdoc},
     volume = {157},
     number = {5},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_157_5_a25/}
}