Fabien Durand (1998):
A characterization of substitutive sequences using return words.
Discrete Math. 179(1-3),
pp. 89–101,
doi:10.1016/S0012-365X(97)00029-0.
Oliver Jenkinson & Luca Q. Zamboni (2004):
Characterisations of balanced words via orderings.
Theoret. Comput. Sci. 310(1-3),
pp. 247–271,
doi:10.1016/S0304-3975(03)00397-9.
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.
M. Lothaire (2002):
Algebraic combinatorics on words.
Encyclopedia of Mathematics and its Applications 90.
Cambridge University Press,
Cambridge.
S. Mantaci, A. Restivo & M. Sciortino (2003):
Burrows-Wheeler transform and Sturmian words.
Inform. Process. Lett. 86(5),
pp. 241–246,
doi:10.1016/S0020-0190(02)00512-4.
Laurent Vuillon (2001):
A characterization of Sturmian words by return words.
European J. Combin. 22(2),
pp. 263–275,
doi:10.1006/eujc.2000.0444.