@article{TM_1973_133_a13,
     author = {A. A. Lyapunov},
     title = {The method of transfinite indices in the theory of operations over sets},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {132--148},
     year = {1973},
     volume = {133},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1973_133_a13/}
}