@article{AL_1970_9_5_a0,
     author = {S. D. Denisov and I. A. Lavrov},
     title = {Complete numerations with an infinite number of special elements},
     journal = {Algebra i logika},
     pages = {503--509},
     publisher = {mathdoc},
     volume = {9},
     number = {5},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1970_9_5_a0/}
}