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Author: Hofmann, Karl Heinrich

• Hofmann, Karl Heinrich: Semigroups and Hilbert's fifth problem. (English). Mathematica Slovaca, vol. 44 (1994), issue 3, pp. 365-377
• Hofmann, Karl Heinrich; Mostert, Paul S.: Connected extensions of simple semigroups. (English). Czechoslovak Mathematical Journal, vol. 15 (1965), issue 2, pp. 295-298