Hutchinson George Allen: Varieties of algebras with linear terms. In: Acta scientiarum mathematicarum, (65) 1-2. pp. 33-45. (1999)
Czédli Gábor; Hutchinson George Allen: An irregular Horn sentence in submodule lattices. In: Acta scientiarum mathematicarum, (51) 1-2. pp. 35-38. (1987)