@article{BSMA_1883_2_7_1_72_1,
     author = {Bertrand, J.},
     title = {Sur les unit\'es \'electriques},
     journal = {Bulletin des Sciences Math\'ematiques et Astronomiques},
     pages = {72--85},
     publisher = {Gauthier-Villars},
     volume = {2e s{\'e}rie, 7},
     number = {1},
     year = {1883},
     language = {fr},
     url = {http://archive.numdam.org/item/BSMA_1883_2_7_1_72_1/}
}