MathSciNet bibliographic data MR312448 (47 #1005) 34A99 (20M20) Bednarek, A. R.; Magill, K. D., Jr. $Q$$Q$-composable properties, semigroups and ${\rm CM}$${\rm CM}$-homomorphisms. Trans. Amer. Math. Soc. 174 1973, 383–398. Article

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