Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{CMUC_1989__30_4_a20, author = {Ku\v{c}era, Anton{\'\i}n}, title = {A note on initial segments below $\utilde O'$}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {779--781}, publisher = {mathdoc}, volume = {30}, number = {4}, year = {1989}, mrnumber = {1045909}, zbl = {0693.03028}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMUC_1989__30_4_a20/} }
Kučera, Antonín. A note on initial segments below $\utilde O'$. Commentationes Mathematicae Universitatis Carolinae, Tome 30 (1989) no. 4, pp. 779-781. http://geodesic.mathdoc.fr/item/CMUC_1989__30_4_a20/