@article{1183514553,
author = {Weyl, Hermann},
title = {Ramifications, old and new, of the eigenvalue problem},
journal = {Bull. Amer. Math. Soc.},
volume = {56},
number = {6},
year = {1950},
pages = { 115-139},
language = {en},
url = {http://dml.mathdoc.fr/item/1183514553}
}
Weyl, Hermann. Ramifications, old and new, of the eigenvalue problem. Bull. Amer. Math. Soc., Tome 56 (1950) no. 6, pp. 115-139. http://gdmltest.u-ga.fr/item/1183514553/