Functional Completeness in the Small Algebraic Structure Theorems and Identities. A.L. FOSTER — 1961 Mathematische Annalen
Automorphisms and Functional Completeness in Universal Algebras. I. General Automorphisms, Structure Theory and Characterization. A.L. FOSTER — 1969 Mathematische Annalen
On the Imbeddability of Universal Algebras in Relation to their Identities. I. A.L. FOSTER — 1959 Mathematische Annalen
Functional Completeness in the Small. II. Algebraic Cluster Theorem. A.L. FOSTER — 1962 Mathematische Annalen
Families of Algebras with Unique (Sub-) Direct Factorization: Equational Characterization of Factorization. A.L. FOSTER — 1966 Mathematische Annalen