Embedding the Dual of Π m in the Lattice of Equational Classes of Commutative Semigroups
Stanley N. Burris, Evelyn M. Nelson · Proceedings of the American Mathematical Society · 1971
Stanley Burris, Evelyn Nelson, Embedding the Dual of $\Pi_m$ in the Lattice of Equational Classes of Commutative Semigroups, Proceedings of the American Mathematical Society, Vol. 30, No. 1 (Sep., 1971), pp. 37-39