@MISC{PattClass2012,
    author = {Albert, Michael and Linton, Steve and Hoffmann, Ruth},
    howpublished = {http://ruthhoffmann.github.io/PatternClass/},
    title = {{PatternClass -- Permutation Pattern Classes}},
    url = {http://ruthhoffmann.github.io/PatternClass/},
    year = {2012}
}