@incollection{Berstel&Sakarovitch:1986,
	key = "Berstel and Sakarovitch 1986",
	author = "J. Berstel and J. Sakarovitch",
	title = "Recent results in the theory of rational sets",
	booktitle = MFCS86,
	series = LNICS,
	volume = 233,
	year = 1986,
	editor = "J. Gruska and B. Rovan and J. Wiedermann",
	publisher = SV,
	pages = "15-28"}

@incollection{Berstel:1989b,
	key = "Berstel 1989b",
	author = "J. Berstel",
	title = "Finite automata and rational languages:  an introduction",
	booktitle = "Formal Properties of Finite Automata and Applications",
	editor = "J. E. Pin",
	publisher = SV,
	series = LNICS,
	volume = 386,
	year = "{\noopsort{1989b}}1989",
	pages = "2-14"}

@book{Berstel&Reutenauer:1988b,
	key = "Berstel and Reutenauer 1988b",
	author = "J. Berstel and C. Reutenauer",
	title = "Rational Series and Their Languages",
	series = EATCS,
	volume = 12,
	publisher = SV,
	year = "{\noopsort{1988b}}1988"}

@article{Bassino:1997,
	key = "Bassino 1997",
	author = "F. Bassino",
	title = "Nonnegative companion matrices and star-height
of {$\En$-rational} series",
	journal = TCS,
	volume = 180,
	year = 1997,
	pages = "61-80",
	comment = "checked"}

@article{Wang:1998,
	key = "Wang 1998",
	author = "H. Wang",
	title = "On rational series and rational languages",
	journal = TCS,
	volume = 205,
	year = 1998,
	pages = "329-336"}

@incollection{Hansel:1985,
	key = "Hansel 1985",
	author = "G. Hansel",
	title = "A simple proof of the {Skolem-Mahler-Lech} theorem",
	booktitle = ICALP85,
	year = 1985,
	publisher = SV,
	series = LNICS,
	volume = 194,
	editor = "W. Brauer",
	pages = "244-249"}

@article{Fliess:1974b,
	key = "Fliess 1974b",
	author = "M. Fliess",
	title = "Matrices de {Hankel}",
	journal = JMPA,
	volume = 53,
	year = "{\noopsort{1974b}}1974",
	pages = "197-224",
	note = "Erratum, {\bf 54} (1975), 481"}

@article{Schutzenberger:1961,
	key = "{Sch\"utzenberger} 1961",
	author = "M. P. {Sch\"utzenberger}",
	title = "On the definition of a family of automata",
	journal = ICTRL,
	volume = 4,
	year = 1961,
	pages = "245-270"}

@article{Schutzenberger:1962,
	key = "{Sch\"utzenberger} 1962",
	author = "M. P. {Sch\"utzenberger}",
	title = "On a theorem of {R. Jungen}",
	journal = PAMS,
	volume = 13,
	year = 1962,
	pages = "885-890"}