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@article{BUMI_1959_3_14_1_a9, author = {Bellman, Richard}, title = {On the variation of the {Fredholm} resolvent.}, journal = {Bollettino della Unione matematica italiana}, pages = {78--81}, publisher = {mathdoc}, volume = {Ser. 3, 14}, number = {1}, year = {1959}, zbl = {0088.08102}, mrnumber = {130543}, language = {en}, url = {http://geodesic.mathdoc.fr/item/BUMI_1959_3_14_1_a9/} }
Bellman, Richard. On the variation of the Fredholm resolvent.. Bollettino della Unione matematica italiana, Série 3, Tome 14 (1959) no. 1, pp. 78-81. http://geodesic.mathdoc.fr/item/BUMI_1959_3_14_1_a9/