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Link to original content: https://dblp.org/rec/journals/tcs/BerstelBCPP06.xml
Jean Berstel Luc Boasson Olivier Carton Bruno Petazzoni Jean-Eric Pin Operations preserving regular languages. 405-420 2006 354 Theor. Comput. Sci. 3 https://doi.org/10.1016/j.tcs.2005.11.034 db/journals/tcs/tcs354.html#BerstelBCPP06