@article{BUMI_1961_3_16_2_a5,
     author = {Bellman, Richard},
     title = {On variation-diminishing properties of {Green's} functions.},
     journal = {Bollettino della Unione matematica italiana},
     pages = {164--166},
     publisher = {mathdoc},
     volume = {Ser. 3, 16},
     number = {2},
     year = {1961},
     zbl = {0099.06805},
     mrnumber = {130429},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1961_3_16_2_a5/}
}