References
Bednarek, A.R.,An extension of Light’s associativity test, Amer. Math. Monthly 75 (1968), 531–532.
Clifford, A.H. and G.B. Preston,The algebraic theory of semigroups, Vol. I, Amer. Math. Soc. (Providence, R.I., 1961).
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Kalman, J.A. Bednarek’s extension of light’s associativity test. Semigroup Forum 3, 275–276 (1971). https://doi.org/10.1007/BF02572966
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DOI: https://doi.org/10.1007/BF02572966