Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1971_196_6_a2, author = {A. G. Dragalin and V. A. Lyubetskii and V. I. Fukson}, title = {Definable sequences of countable ordinals}, journal = {Doklady Akademii Nauk}, pages = {1263--1265}, publisher = {mathdoc}, volume = {196}, number = {6}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1971_196_6_a2/} }
A. G. Dragalin; V. A. Lyubetskii; V. I. Fukson. Definable sequences of countable ordinals. Doklady Akademii Nauk, Tome 196 (1971) no. 6, pp. 1263-1265. http://geodesic.mathdoc.fr/item/DAN_1971_196_6_a2/