@article{ASENS_1971_4_4_3_393_0,
     author = {Verma, Daya-Nand},
     title = {M\"obius inversion for the {Bruhat} ordering on a {Weyl} group},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {393--398},
     publisher = {Elsevier},
     volume = {Ser. 4, 4},
     number = {3},
     year = {1971},
     doi = {10.24033/asens.1215},
     mrnumber = {45 #139},
     zbl = {0236.20035},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/asens.1215/}
}