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@article{BUMI_1957_3_12_3_a5, author = {Bellman, Richard}, title = {On the non-negativity of {Green's} functions.}, journal = {Bollettino della Unione matematica italiana}, pages = {411--413}, publisher = {mathdoc}, volume = {Ser. 3, 12}, number = {3}, year = {1957}, zbl = {0085.31202}, mrnumber = {104860}, language = {en}, url = {http://geodesic.mathdoc.fr/item/BUMI_1957_3_12_3_a5/} }
Bellman, Richard. On the non-negativity of Green's functions.. Bollettino della Unione matematica italiana, Série 3, Tome 12 (1957) no. 3, pp. 411-413. http://geodesic.mathdoc.fr/item/BUMI_1957_3_12_3_a5/
[1] A Characterization of Positive Reproducing Kernels, Application to Green's Functions Studies in Eigenvalue Problems, Technical Report 15, U. of Kansas, 1956. | Zbl
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