@article{JMPA_1935_9_14_1-4_113_0,
     author = {Haag, J.},
     title = {Th\'eorie de la suspension \'elastique des pendules},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {113--208},
     publisher = {Gauthier-Villars},
     volume = {9e s{\'e}rie, 14},
     number = {1-4},
     year = {1935},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1935_9_14_1-4_113_0/}
}