@article{JMPA_1923_9_2__327_0,
     author = {Hedrick, E. R. and Ingold, Louis and Westfall, W. D. A.},
     title = {Theory of non-analytic {Functions} of a complex {Variable}},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {327--342},
     publisher = {Gauthier-Villars},
     volume = {Ser. 9, 2},
     year = {1923},
     language = {en},
     url = {http://www.numdam.org/item/JMPA_1923_9_2__327_0/}
}