Algebraic and Model Theoretic Techniques for Fusion Decidability in Modal Logics.

Silvio Ghilardi Luigi Santocanale Algebraic and Model Theoretic Techniques for Fusion Decidability in Modal Logics. 152-166 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2850&spage=152 2003 conf/lpar/2003 LPAR db/conf/lpar/lpar2003.html#GhilardiS03