@article{JMPA_1923_9_2__193_0,
     author = {N\"orlund, N.-E.},
     title = {Remarques diverses sur le calcul aux diff\'erences finies},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {193--214},
     publisher = {Gauthier-Villars},
     volume = {9e s{\'e}rie, 2},
     year = {1923},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1923_9_2__193_0/}
}