Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{PMFA_1982__27_2_a3, author = {K\"onigsdorf, Helga}, title = {Lemma 1}, journal = {Pokroky matematiky, fyziky a astronomie}, pages = {101--106}, publisher = {mathdoc}, volume = {27}, number = {2}, year = {1982}, language = {cz}, url = {http://geodesic.mathdoc.fr/item/PMFA_1982__27_2_a3/} }
Königsdorf, Helga. Lemma 1. Pokroky matematiky, fyziky a astronomie, Tome 27 (1982) no. 2, pp. 101-106. http://geodesic.mathdoc.fr/item/PMFA_1982__27_2_a3/