@Article{	  DuvalHarjuNowotka08,
  author	= "Jean-Pierre Duval and Tero Harju and Dirk Nowotka",
  journal	= "Discrete Mathematics",
  number	= "11",
  pages		= "2261--2264",
  title		= "Unbordered factors and Lyndon words.",
  volume	= "308",
  year		= "2008",
  doi		= "10.1016/j.disc.2006.09.054"
}