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@article{BUMI_1963_3_18_3_a4, author = {Bellman, Richard}, title = {On the nonnegativity of {Green's} functions.}, journal = {Bollettino della Unione matematica italiana}, pages = {219--221}, publisher = {mathdoc}, volume = {Ser. 3, 18}, number = {3}, year = {1963}, zbl = {0117.31401}, mrnumber = {167668}, language = {en}, url = {http://geodesic.mathdoc.fr/item/BUMI_1963_3_18_3_a4/} }
Bellman, Richard. On the nonnegativity of Green's functions.. Bollettino della Unione matematica italiana, Série 3, Tome 18 (1963) no. 3, pp. 219-221. http://geodesic.mathdoc.fr/item/BUMI_1963_3_18_3_a4/
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,[2] On the Nonnegativity of the Heat Equation, Boll. U. M. I. Vol. 12, 1957, pp. 520-523. | fulltext bdim | MR | Zbl
,[3] Inequalities, Ergebnisse der Math., «Springer, Berlin», 1961. | Zbl
, and ,[4] An Introduction to Matrix Analysis, «McGraw-Hill Book Company», Inc., New York, 1960. | MR | Zbl
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