Equivalence Relations versus Unary Operations. - Manfred Armbrust (Math. Log. Q., 1983)

Book reviews. - D. Baum; K. Schittkowski; Manfred Armbrust; J. Zowe; K. Nickel; Peter Brucker; G. Hübner; G. Trenkler; Johannes Jahn; T. Hanschke (Z. Oper. Research, 1985)

An Equivalence-Theoretic Equivalent of the Axiom of Choice. - Manfred Armbrust (Math. Log. Q., 1986)

Book review. - Manfred Armbrust (ZOR Methods Model. Oper. Res., 1988)