@article{BUMI_1960_3_15_1_a7,
     author = {Bellman, Richard},
     title = {On the separation of exponentials.},
     journal = {Bollettino della Unione matematica italiana},
     pages = {38--39},
     publisher = {mathdoc},
     volume = {Ser. 3, 15},
     number = {1},
     year = {1960},
     zbl = {0101.04704},
     mrnumber = {123868},
     language = {it},
     url = {https://geodesic-test.mathdoc.fr/item/BUMI_1960_3_15_1_a7/}
}