@article{JRAM_1988__383_152992,
     author = {R.S. Irving and D.A. Collingwood},
     title = {Filtrations on generalized {Verma} modules for {Hermitian} symmetric pairs.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {54--86},
     publisher = {mathdoc},
     volume = {383},
     year = {1988},
     zbl = {0631.22014},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1988__383_152992/}
}