@article{DAN_1968_182_2_a4,
     author = {A. D. Korshunov},
     title = {Number, degree of distinguishability and diameter of permutation automata and of operators realizable by them},
     journal = {Doklady Akademii Nauk},
     pages = {262--265},
     publisher = {mathdoc},
     volume = {182},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_182_2_a4/}
}