Circuits and Expressions with NOn-Associative Gates. - Joshua Berman; Arthur Drisko; François Lemieux; Cristopher Moore; Denis Thérien (CCC, 1997)

Circuits and Expressions with Nonassociative Gates. - Cristopher Moore; Denis Thérien; François Lemieux; Joshua Berman; Arthur Drisko (J. Comput. Syst. Sci., 2000)