<bibliography>
 <citation type="article" key="durand">
  <author>Fabien Durand</author>
  <year>1998</year>
  <title>A characterization of substitutive sequences using return words</title>
  <journal>Discrete Math.</journal>
  <volume>179</volume>
  <number>1-3</number>
  <pages>89&#8211;101</pages>
  <doi>10.1016/S0012-365X(97)00029-0</doi>
 </citation>
 <citation type="article" key="jz">
  <author>Oliver Jenkinson</author>
  <author>Luca Q. Zamboni</author>
  <year>2004</year>
  <title>Characterisations of balanced words via orderings</title>
  <journal>Theoret. Comput. Sci.</journal>
  <volume>310</volume>
  <number>1-3</number>
  <pages>247&#8211;271</pages>
  <doi>10.1016/S0304-3975(03)00397-9</doi>
 </citation>
 <citation type="article" key="jv">
  <author>Jacques Justin</author>
  <author>Laurent Vuillon</author>
  <year>2000</year>
  <title>Return words in Sturmian and episturmian words</title>
  <journal>Theor. Inform. Appl.</journal>
  <volume>34</volume>
  <number>5</number>
  <pages>343&#8211;356</pages>
  <doi>10.1051/ita:2000121</doi>
 </citation>
 <citation type="book" key="lothaire">
  <author>M. Lothaire</author>
  <year>2002</year>
  <title>Algebraic combinatorics on words</title>
  <series>Encyclopedia of Mathematics and its Applications</series>
  <volume>90</volume>
  <publisher>Cambridge University Press</publisher>
  <address>Cambridge</address>
 </citation>
 <citation type="article" key="mr">
  <author>S. Mantaci</author>
  <author>A. Restivo</author>
  <author>M. Sciortino</author>
  <year>2003</year>
  <title>Burrows-Wheeler transform and Sturmian words</title>
  <journal>Inform. Process. Lett.</journal>
  <volume>86</volume>
  <number>5</number>
  <pages>241&#8211;246</pages>
  <doi>10.1016/S0020-0190(02)00512-4</doi>
 </citation>
 <citation type="article" key="vuillon">
  <author>Laurent Vuillon</author>
  <year>2001</year>
  <title>A characterization of Sturmian words by return words</title>
  <journal>European J. Combin.</journal>
  <volume>22</volume>
  <number>2</number>
  <pages>263&#8211;275</pages>
  <doi>10.1006/eujc.2000.0444</doi>
 </citation>
</bibliography>
