@article{ASENS_1983_4_16_3_489_0,
     author = {Barbasch, Dan},
     title = {Filtrations on {Verma} modules},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {489--494},
     publisher = {Elsevier},
     volume = {Ser. 4, 16},
     number = {3},
     year = {1983},
     doi = {10.24033/asens.1457},
     mrnumber = {85j:17013},
     zbl = {0581.17002},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/asens.1457/}
}