1. K. A. Baker, P. C. Fishburn, andF. S. Roberts,Partial orders of dimension 2, interval orders, and interval graphs, Rand Corp. (1970), p. 4376, Networks2 (1971), 11–28.
2. C. C. Chen, K. M. Koh, andS. K. Tan, Frattini sublattices of distributive lattices, Algebra Universalis3 (1973), 294–303.
3. K. M. Koh,New generators of the Frattini sublattice of a finite distributive lattice, Annnales Univ. Scient. Budapestinensis23 (1980), 197–204.
4. I. Rival,Maximal proper sublattices of finite distributive lattices, Proc. Amer. Math. Soc.37 (1973) 417–420.
5. I. Rival,Maximal sublattices of finite distributive lattices II, Proc. Amer. Math. Soc.44 (1974), 263–268.