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Series rationnelles. (French) Zbl 0401.16001
Series formelles en variables non commutatives et applications, Actes 5ieme Ec. de Printemps d’Inf. theor., Vieux-Boucau les Bains 1977, 5-22 (1978).

MSC:
16W60 Valuations, completions, formal power series and related constructions (associative rings and algebras)
16Y60 Semirings
68Q45 Formal languages and automata