@article{02186439,
title = {Constructing homomorphisms between Verma modules.},
journal = {Journal of Lie Theory},
volume = {15},
year = {2005},
pages = {415-428},
zbl = {1064.17004},
language = {en},
url = {http://dml.mathdoc.fr/item/02186439}
}
de Graaf, Willem A. Constructing homomorphisms between Verma modules.. Journal of Lie Theory, Tome 15 (2005) pp. 415-428. http://gdmltest.u-ga.fr/item/02186439/