1. Aguiar M., Livernet M.: The associative operad and the weak order on the symmetric groups. J. Homotopy Relat. Struct. 2, 57–84 (2007)
2. Boyd S. J., Gould M.: Interassociativity and isomorphism. Pure Math. Appl. 10, 23–30 (1999)
3. Boyd, S.J., Gould, M., Nelson, A.W.: Interassociativity of semigroups. Proceedings of the Tennessee Topology Conference, Nashville, TN, USA, 1996, pp. 33–51. World Scientific, Singapore (1997)
4. Clifford, A.H., Preston, G.B.: Algebraic Theory of Semigroups. Amer. Math. Soc. 1, 2 (1964), (1967)
5. Drouzy, M.: La structuration des ensembles de semigroupes d’ordre 2, 3 et 4 par la relation d’interassociativité. Manuscript (1986)