@article{JMPA_1902_5_8__59_0,
     author = {Zaremba, S.},
     title = {Sur l'int\'egration de l'\'equation $\Delta u+\xi u =0$},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {59--117},
     publisher = {Gauthier-Villars},
     volume = {5e s{\'e}rie, 8},
     year = {1902},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1902_5_8__59_0/}
}