1. Birkhoff, G., Review of [5], Math. Reviews18 (1957), 868.
2. Birkhoff, G.,Lattice Theory. Third edition, Amer. Math. Soc., Providence, R.I., 1967.
3. Birkhoff, G. andFrink, O.,Representations of lattices by sets, Trans. Amer. Math. Soc.64 (1948), 299?316.
4. Büchi, J. R.,Representations of complete lattices by sets, Portugal. Math.11 (1952), 151?167.
5. Diener, K.-H.,über zwei Birkhoff-Frinksche StruktursÄtze der allgemeinen Algebra, Arch. Math.7 (1956), 339?345.