1. Dimension, join-independence, and breadth in partially ordered sets;Baker,1961
2. Hüllensysteme und Erweiterungen von Quasi-Ordnungen;Banaschewski;Z. Math. Logik Grundlagen Math.,1956
3. Lattice Theory;Birkhoff,1967
4. Partially ordered sets;Dushnik;Amer. J. Math.,1941
5. On the dimension of orders;Hiraguchi,1955