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Author: Michel, Horst

• Michel, Horst: Generation of operation-invariant classes of sets. (English). Mathematica Slovaca, vol. 33 (1983), issue 3, pp. 257-268,264
• Michel, Horst: Support as an invariant for dynamical systems. (English). Mathematica Slovaca, vol. 30 (1980), issue 1, pp. 19-30