@article{MAN_1993__297_3_165157,
     author = {Andrew Swann and Piotr Z. Kobak},
     title = {Quaternionic geometry of a nilpotent variety.},
     journal = {Mathematische Annalen},
     pages = {747--764},
     publisher = {mathdoc},
     volume = {297},
     number = {3},
     year = {1993},
     zbl = {0807.53040},
     url = {http://geodesic.mathdoc.fr/item/MAN_1993__297_3_165157/}
}