@article{GDZPPN002315890, title = {Horizontal SL2-Orbits in Flag Domains.}, journal = {Mathematische Annalen}, volume = {237}, year = {1978}, pages = {17-36}, zbl = {0363.32022}, url = {http://dml.mathdoc.fr/item/GDZPPN002315890} }
Cattani, Eduardo H.; Kaplan, Aroldo G. Horizontal SL2-Orbits in Flag Domains.. Mathematische Annalen, Tome 237 (1978) pp. 17-36. http://gdmltest.u-ga.fr/item/GDZPPN002315890/