Variations in definition of ultraproducts of a family of first order relational structures. - Wilfred G. Malcolm (Notre Dame J. Formal Log., 1972)

Some results and algebraic applications in the theory of higher-order ultraproducts. - Wilfred G. Malcolm (Notre Dame J. Formal Log., 1974)

Meeting of the Association for Symbolic Logic: Hamilton, New Zealand, 1979. - Wilfred G. Malcolm; M. J. Cresswell (J. Symb. Log., 1981)

Meeting of the Association for Symbolic Logic: Wellington, New Zealand, 1981. - Wilfred G. Malcolm; M. J. Cresswell (J. Symb. Log., 1983)