@misc{MARSLBB_1891__50_251917,
     title = {[unknown]},
     journal = {M\'emoires de l 'Acad\'emie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique},
     pages = {122--124},
     publisher = {mathdoc},
     volume = {50},
     year = {1891},
     url = {http://geodesic.mathdoc.fr/item/MARSLBB_1891__50_251917/}
}