Avoiding squares and overlaps over the natural numbers. Guay-Paquet, M. & Shallit, J. Discrete Mathematics, 309(21):6245–6254, 2009.
Avoiding squares and overlaps over the natural numbers [link]Paper  doi  bibtex   
@article{DBLP:journals/dm/Guay-PaquetS09,
  author    = {Mathieu Guay{-}Paquet and
               Jeffrey Shallit},
  title     = {Avoiding squares and overlaps over the natural numbers},
  journal   = {Discrete Mathematics},
  volume    = {309},
  number    = {21},
  pages     = {6245--6254},
  year      = {2009},
  url       = {https://doi.org/10.1016/j.disc.2009.06.004},
  doi       = {10.1016/j.disc.2009.06.004},
  timestamp = {Sun, 28 May 2017 01:00:00 +0200},
  biburl    = {https://dblp.org/rec/bib/journals/dm/Guay-PaquetS09},
  bibsource = {dblp computer science bibliography, https://dblp.org}
}

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