@article{JMPA_1946_9_25__257_0,
     author = {Haag, Jules},
     title = {Sur les vibrations de certaines machines reposant sur des ressorts},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {257--288},
     volume = {9e s{\'e}rie, 25},
     year = {1946},
     mrnumber = {23662},
     zbl = {0061.41811},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1946_9_25__257_0/}
}