PP-2010-08: de Jongh, Dick and Yang, Fan (2010) Jankov's Theorems for Intermediate Logics in the Setting of Universal Models. [Report]
MoL-2008-12: Yang, Fan (2008) Intuitionistic Subframe Formulas, NNIL-Formulas and n-universal Models. [Report]
X-2007-03: Yang, Fan (2007) On HS=SH and Duality Theorems of Intuitionistic Descriptive Frames. [Report]