Words guaranteeing minimal image

Stuart W. Margolis, Jean-Eric Pin, and Mikhail V. Volkov
Proc. 3rd Int. Colloq. Words, Languages and Combinatorics (ICWLC 2000), Masami Ito and Teruo Imaoka, ed., World Scientific, 2003, pp. 297–310
Int. J. Foundations of Computer Science 15:259–276, 2004
http://www.liafa.jussieu.fr/~jep/PDF/Kyoto.pdf

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