1 - The algebraic theory of semigroups. Volume 1Clifford, Alfred Hoblitzelle (1908-1992) / Preston, Gordon B.Cote : [20 CLI 61-1]
2 - The algebraic theory of semigroups. Volume 2Clifford, Alfred Hoblitzelle (1908-1992) / Preston, Gordon B.Cote : [20 CLI 67-2]