References

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  3. Jacques Justin & Laurent Vuillon (2000): Return words in Sturmian and episturmian words. Theor. Inform. Appl. 34(5), pp. 343–356, doi:10.1051/ita:2000121.
  4. M. Lothaire (2002): Algebraic combinatorics on words. Encyclopedia of Mathematics and its Applications 90. Cambridge University Press, Cambridge.
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