@article{IM_1989__96_1_143684,
     author = {Y.L. Tong and S.P. Wang},
     title = {Geometric realization of discrete series for semisimple symmetric spaces.},
     journal = {Inventiones mathematicae},
     pages = {425--458},
     publisher = {mathdoc},
     volume = {96},
     number = {1},
     year = {1989},
     zbl = {0685.22008},
     url = {http://geodesic.mathdoc.fr/item/IM_1989__96_1_143684/}
}