Voir la notice de l'article provenant de la source Proyecto DML-E: Biblioteca Digital de Matemáticas
@article{CLTM_1971_1971_1_a2, author = {Lempert, Heinrich Kurt}, title = {Zur {Storungstheorie} endlich-vielfacher {Eigenwerte.}}, journal = {Collectanea mathematica}, pages = {19-50}, publisher = {mathdoc}, volume = {22}, number = {1}, year = {1971}, zbl = {0228.47011}, url = {http://geodesic.mathdoc.fr/item/CLTM_1971_1971_1_a2/} }
Lempert, Heinrich Kurt. Zur Storungstheorie endlich-vielfacher Eigenwerte.. Collectanea mathematica, Tome 22 (1971) no. 1. http://geodesic.mathdoc.fr/item/CLTM_1971_1971_1_a2/