@article{BSMA_1884_2_8_1_206_1,
     title = {Acad\'emie royale danoise des sciences et des lettres. Classe des sciences math\'ematiques},
     journal = {Bulletin des Sciences Math\'ematiques et Astronomiques},
     publisher = {Gauthier-Villars},
     volume = {2e s{\'e}rie, 8},
     number = {1},
     year = {1884},
     pages = {206-208},
     language = {fr},
     url = {http://www.numdam.org/item/BSMA_1884_2_8_1_206_1}
}