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@article{AL_1974_13_6_a3, author = {I. A. Lavrov}, title = {Certain properties of retracts of {Post} numerations}, journal = {Algebra i logika}, pages = {662--675}, publisher = {mathdoc}, volume = {13}, number = {6}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1974_13_6_a3/} }
I. A. Lavrov. Certain properties of retracts of Post numerations. Algebra i logika, Tome 13 (1974) no. 6, pp. 662-675. http://geodesic.mathdoc.fr/item/AL_1974_13_6_a3/