@article{BUMI_1961_3_16_2_164_0, author = {Richard Bellman}, title = {On variation-diminishing properties of Green's functions.}, journal = {Bollettino dell'Unione Matematica Italiana}, volume = {16}, year = {1961}, pages = {164-166}, zbl = {0099.06805}, mrnumber = {130429}, language = {en}, url = {http://dml.mathdoc.fr/item/BUMI_1961_3_16_2_164_0} }
Bellman, Richard. On variation-diminishing properties of Green's functions.. Bollettino dell'Unione Matematica Italiana, Tome 16 (1961) pp. 164-166. http://gdmltest.u-ga.fr/item/BUMI_1961_3_16_2_164_0/
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