@article{10_37236_1871,
     author = {John R. Stembridge},
     title = {Tight quotients and double quotients in the {Bruhat} order.},
     journal = {The electronic journal of combinatorics},
     year = {2004},
     volume = {11},
     number = {2},
     doi = {10.37236/1871},
     zbl = {1067.20053},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1871/}
}