@article{JAC_2009__30_1_a2,
     author = {Hultman, Axel and Vorwerk, Kathrin},
     title = {Pattern avoidance and {Boolean} elements in the {Bruhat} order on involutions},
     journal = {Journal of Algebraic Combinatorics},
     pages = {87--102},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_2009__30_1_a2/}
}