@article{DAN_1970_193_6_a4,
     author = {A. D. Korshunov},
     title = {The power of certain classes of graphs},
     journal = {Doklady Akademii Nauk},
     pages = {1230--1233},
     publisher = {mathdoc},
     volume = {193},
     number = {6},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_193_6_a4/}
}