@article{DAN_1965_162_3_a9,
     author = {M. A. Spivak},
     title = {The decomposition of regular expressions in terms of a basis, and its applications},
     journal = {Doklady Akademii Nauk},
     pages = {520--522},
     publisher = {mathdoc},
     volume = {162},
     number = {3},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_162_3_a9/}
}