1. Rings and Categories of Modules;Anderson,1973
2. Abelian Categories: An Introduction to the Theory of Functors;Freyd,1964
3. Modular lattices and abelian categories;Hutchinson;J. Algebra,1971
4. Recursively unsolvable word problems of modular lattices and diagram-chasing;Hutchinson;J. Algebra,1973
5. On classes of lattices representable by modules;Hutchinson;Proc. Univ. of Houston Lattice Theory Conference,1973