@article{10_4153_CJM_2000_012_9,
     author = {Brion, Michel and Helminck, Aloysius G.},
     title = {On {Orbit} {Closures} of {Symmetric} {Subgroups} in {Flag} {Varieties}},
     journal = {Canadian journal of mathematics},
     pages = {265--292},
     year = {2000},
     volume = {52},
     number = {2},
     doi = {10.4153/CJM-2000-012-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2000-012-9/}
}