@article{MM2_1991__72_1_155648,
     author = {Peter Fleischmann and Ingo Janiszczak},
     title = {The lattices and {M\"obius} functions of stable closed subrootsystems and {Hyperplane} complements for classical {Weyl} {Groups.}},
     journal = {Manuscripta mathematica},
     pages = {375--404},
     publisher = {mathdoc},
     volume = {72},
     number = {1},
     year = {1991},
     zbl = {0790.52006},
     url = {http://geodesic.mathdoc.fr/item/MM2_1991__72_1_155648/}
}