Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1979__239_163221, author = {Ky Fan}, title = {Julia's {Lemma} for {Operators.}}, journal = {Mathematische Annalen}, pages = {241--246}, publisher = {mathdoc}, volume = {239}, year = {1979}, zbl = {0378.47004}, url = {http://geodesic.mathdoc.fr/item/MAN_1979__239_163221/} }
Ky Fan. Julia's Lemma for Operators.. Mathematische Annalen, Tome 239 (1979), pp. 241-246. http://geodesic.mathdoc.fr/item/MAN_1979__239_163221/