@inproceedings{bridges2012:485,
  author      = {Kerkez, Boris},
  title       = {Extension of Neo-Riemannian \emph{PLR-group} to Seventh Chords},
  pages       = {485--488},
  booktitle   = {Proceedings of Bridges 2012: Mathematics, Music, Art, Architecture, Culture},
  year        = {2012},
  editor      = {Bosch, Robert and McKenna, Douglas and Sarhangi, Reza},
  isbn        = {978-1-938664-00-7},
  issn        = {1099-6702},
  publisher   = {Tessellations Publishing},
  address     = {Phoenix, Arizona},

  url         = {http://archive.bridgesmathart.org/2012/bridges2012-485.html}
}