@article{CMH_1991__66_4_140235,
     author = {J. Brzezinski},
     title = {On embedding numbers into quaternion orders.},
     journal = {Commentarii mathematici Helvetici},
     pages = {302--318},
     publisher = {mathdoc},
     volume = {66},
     number = {4},
     year = {1991},
     zbl = {0733.11047},
     url = {http://geodesic.mathdoc.fr/item/CMH_1991__66_4_140235/}
}