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@article{AL_1969_8_2_a1, author = {N. V. Beljakin}, title = {A variant of {Richter's} constructive ordinals}, journal = {Algebra i logika}, pages = {154--171}, publisher = {mathdoc}, volume = {8}, number = {2}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1969_8_2_a1/} }
N. V. Beljakin. A variant of Richter's constructive ordinals. Algebra i logika, Tome 8 (1969) no. 2, pp. 154-171. http://geodesic.mathdoc.fr/item/AL_1969_8_2_a1/