@article{ASENS_1984_4_17_2_269_0,
     author = {Benabdallah, Abdel-Ilah},
     title = {L{\textquoteright}op\'erateur de {Casimir} de ${\rm SL}(2,\,{R})$},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {269--291},
     publisher = {Elsevier},
     volume = {4e s{\'e}rie, 17},
     number = {2},
     year = {1984},
     doi = {10.24033/asens.1472},
     mrnumber = {86b:22014},
     zbl = {0543.22006},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/asens.1472/}
}