Equivalence, Indicators, Quasi-indicators and Optimal Steiner Topologies on Four Points in Space.

J. F. Weng James MacGregor Smith Marcus Brazil D. A. Thomas Equivalence, Indicators, Quasi-indicators and Optimal Steiner Topologies on Four Points in Space. 135-149 2008 84 Fundam. Inform. 1 http://iospress.metapress.com/content/a61650l61h222w85/ db/journals/fuin/fuin84.html#WengSBT08