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@article{MAN_1953__126_160343, author = {T. Kato}, title = {On {Some} {Approximate} {Methods} {Concerning} the {Operators} {T*} {T} .}, journal = {Mathematische Annalen}, pages = {253--262}, publisher = {mathdoc}, volume = {126}, year = {1953}, zbl = {0051.09203}, url = {http://geodesic.mathdoc.fr/item/MAN_1953__126_160343/} }
T. Kato. On Some Approximate Methods Concerning the Operators T* T .. Mathematische Annalen, Tome 126 (1953), pp. 253-262. http://geodesic.mathdoc.fr/item/MAN_1953__126_160343/