@article{01873026,
title = {Homomorphisms and extensions of principal series representations.},
journal = {Journal of Lie Theory},
volume = {13},
year = {2003},
pages = {193-212},
zbl = {1026.17009},
language = {en},
url = {http://dml.mathdoc.fr/item/01873026}
}
Stroppel, Catharina. Homomorphisms and extensions of principal series representations.. Journal of Lie Theory, Tome 13 (2003) pp. 193-212. http://gdmltest.u-ga.fr/item/01873026/