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@article{SF_1971__3_133868, author = {J.A. Kalman}, title = {Bednarek's extension of {Light's} associativity test.}, journal = {Semigroup forum}, pages = {275--276}, publisher = {mathdoc}, volume = {3}, year = {1971}, zbl = {0246.20062}, url = {http://geodesic.mathdoc.fr/item/SF_1971__3_133868/} }
J.A. Kalman. Bednarek's extension of Light's associativity test.. Semigroup forum, Tome 3 (1971), pp. 275-276. http://geodesic.mathdoc.fr/item/SF_1971__3_133868/