@article{1261415781, author = {KATO, Tosio}, title = {On the perturbation theory of closed linear operators.}, journal = {J. Math. Soc. Japan}, volume = {4}, number = {3-4}, year = {1952}, pages = { 323-337}, language = {en}, url = {http://dml.mathdoc.fr/item/1261415781} }
KATO, Tosio. On the perturbation theory of closed linear operators.. J. Math. Soc. Japan, Tome 4 (1952) no. 3-4, pp. 323-337. http://gdmltest.u-ga.fr/item/1261415781/