@ARTICLE{RetyVuottoENTCS-02,
	AUTHOR = "P. R\'ety and J. Vuotto",
	TITLE = "{R}egular {S}ets of {D}escendants by {L}eftmost {S}trategy",
	JOURNAL = "Electronic Notes in Theoretical Computer Science",
	YEAR = 2002,
	VOLUME = 70,
	NUMBER = 6,
        EDITOR = {Elsevier}
}