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Un outil algébrique: Les séries formelles non commutatives. (French) Zbl 0363.93008
Math. Syst. Theory, Proc. int. Symp., Udine 1975, Lect. Notes Econ. math. Syst. 131, 122-148 (1976).

93A99 General systems theory
93B99 Controllability, observability, and system structure
93C99 Model systems in control theory
93C10 Nonlinear systems in control theory
68Q45 Formal languages and automata
16U10 Integral domains (associative rings and algebras)