Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{CMH_1970__45_139455, author = {Peter Hess and Tosio Kato}, title = {Perturbation of {Closed} {Operators} and {Their} {Adjoints.}}, journal = {Commentarii mathematici Helvetici}, pages = {524--529}, publisher = {mathdoc}, volume = {45}, year = {1970}, zbl = {0263.47015}, url = {http://geodesic.mathdoc.fr/item/CMH_1970__45_139455/} }
Peter Hess; Tosio Kato. Perturbation of Closed Operators and Their Adjoints.. Commentarii mathematici Helvetici, Tome 45 (1970), pp. 524-529. http://geodesic.mathdoc.fr/item/CMH_1970__45_139455/