@article{MAN_1974__212_182745,
     author = {Andrew John Sommese},
     title = {Quaternionic {Manifolds.}},
     journal = {Mathematische Annalen},
     pages = {191--214},
     publisher = {mathdoc},
     volume = {212},
     year = {1974},
     zbl = {0299.53023},
     url = {http://geodesic.mathdoc.fr/item/MAN_1974__212_182745/}
}