@article{JMPA_1922_9_1__393_0,
     author = {Wilczynski, E.-J.},
     title = {Differential {Properties} of {Functions} of a {Complex} {Variable} which are {Invariant} under {Linear} {Transformations;} part {I}},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {393--435},
     publisher = {Gauthier-Villars},
     volume = {Ser. 9, 1},
     year = {1922},
     language = {en},
     url = {http://www.numdam.org/item/JMPA_1922_9_1__393_0/}
}