@Article{nested-synteny,
  title =	 {Structural Properties and Tractability Results for
                  Linear Synteny},
  author =	 {David Liben-Nowell and Jon Kleinberg},
  journal =	 {Journal of Discrete Algorithms},
  year =	 2004,
  volume =	 2,
  number =	 2,
  pages =	 {207--228},
  month =	 jun
}