@INCOLLECTION{PurBlaObe08,
    author = "Purwins, Hendrik and Blankertz, Benjamin and Obermayer, Klaus",
    editor = "Hewlett, Walter B. and Selfridge-Field, Eleanor",
    title = "Toroidal Models in Tonal Theory and Pitch- Class Analysis",
    booktitle = "Tonal Theory for the Digital Age, Computing in Musicology",
    publisher = "Center for Computer Assisted Research in the Humanities and MIT Press",
    year = "2008",
    volume = "15",
    pages = "74-103",
    address = "Menlo Park",
    pdf = "http://doc.ml.tu-berlin.de/bbci/publications/PurBlaObe08.pdf"
}