@article{JOLT_2005_15_2_a3,
     author = {W. A. d. Graaf},
     title = {Constructing {Homomorphisms} between {Verma} {Modules}},
     journal = {Journal of Lie Theory},
     pages = {415--428},
     year = {2005},
     volume = {15},
     number = {2},
     doi = {10.5802/jolt.383},
     zbl = {1064.17004},
     url = {https://jolt.centre-mersenne.org/articles/10.5802/jolt.383/}
}