1. Adaricheva, K. V.,Characterization of finite lattices of subsemilattices (in Russian). Algebra i Logica30 (1991), 385?404.
2. Adaricheva, K. V.,On sublattices of finite lattices of subsemilattices. The II International Conference on Algebra in Honor of A. I. Shirshov, Thesises of Conference, vol. 4, p. 20.
3. Day, A.,Characterization of finite lattices that are bounded homomorphic images or sublattices of free lattices. Can. J. Math.30 (1979), 69?78.
4. Freese, R., Je?ek, J. andNation, J. B.,Free Lattices, Mathematical Surveys and Monographs 42, Amer. Math. Soc., Providence, R.I., 1995.
5. McKenzie, R.,Equational bases and nonmodular lattice varieties. Trans. Amer. Math. Soc.174 (1972), 1?43.