@Article{	  HarjuN10ipl,
  author	= "Tero Harju and Dirk Nowotka",
  title		= "Cyclically repetition-free words on small alphabets",
  journal	= "Information Processing Letters",
  year		= "2010",
  volume	= "110",
  number	= "14-15",
  pages		= "591--595",
  publisher	= "Elsevier Science Publishers Ltd.",
  address	= "Essex, UK",
  issn		= "0020-0190",
  doi		= "10.1016/j.ipl.2010.05.005"
}