1. Freese R., Ježek J., Nation J.B.: Lattices with large minimal extensions. Algebra Universalis 45, 221–309 (2001)
2. J. Ježek and R. McKenzie, Definability in substructure orderings, I: finite semilattices, Algebra Universalis, to appear.
3. J. Ježek and R. McKenzie, Definability in substructure orderings, II: finite ordered sets, in progress.
4. J. Ježek and R. McKenzie, Definability in substructure orderings, III: finite distributive lattices, Algebra Universalis, to appear.
5. McKenzie R., McNulty G., Taylor W.: Algebras, Lattices, Varieties, Volume I. Wadsworth & Brooks/Cole, Monterey, CA (1987)