@article{MAN_1991__290_4_164821,
     author = {Dominic Joyce},
     title = {The hypercomplex quotient and the quaternionic quotient.},
     journal = {Mathematische Annalen},
     pages = {323--340},
     year = {1991},
     volume = {290},
     number = {4},
     zbl = {0723.53043},
     url = {http://geodesic.mathdoc.fr/item/MAN_1991__290_4_164821/}
}