@article{BUMI_1964_3_19_3_a7,
     author = {Bellman, Richard},
     title = {Oscillatroy and unimodal properties of solutions of second order linear  differential equations.},
     journal = {Bollettino della Unione matematica italiana},
     pages = {306--310},
     publisher = {mathdoc},
     volume = {Ser. 3, 19},
     number = {3},
     year = {1964},
     zbl = {0136.07604},
     mrnumber = {168837},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1964_3_19_3_a7/}
}