On the equivalence of certain coincidence theorems and fixed point theorems T. Muenzenherger; R. Smithson — 1974 Fundamenta Mathematicae
Fixed point theorems for pseudo-monotone multifunctions R. E. Smithson — 1972 Colloquium Mathematicae
Fixed points and proximate fixed points T. B. Muenzenherger; R. E. Smithson — 1968 Fundamenta Mathematicae