@article{JMPA_1937_9_16_1-4_151_0,
     author = {Bell, E. T.},
     title = {General theorems on numerical functions},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {151--154},
     publisher = {Gauthier-Villars},
     volume = {Ser. 9, 16},
     number = {1-4},
     year = {1937},
     zbl = {0016.29001},
     language = {en},
     url = {http://www.numdam.org/item/JMPA_1937_9_16_1-4_151_0/}
}