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Link to original content: https://dblp.org/rec/journals/jcss/BerstelB97.xml
Jean Berstel Luc Boasson The Set of Minimal Words of a Context-Free Language is Context-Free. 477-488 1997 55 J. Comput. Syst. Sci. 3 db/journals/jcss/jcss55.html#BerstelB97 https://doi.org/10.1006/jcss.1997.1497