PP-2016-20: Bezhanishvili, Nick and de Jongh, Dick and Tzimoulis, Apostolos and Zhao, Zhiguang (2016) Universal models for the positive fragment of intuitionistic logic. [Report]
PP-2014-06: de Jongh, Dick and Zhao, Zhiguang (2014) Positive Formulas in Intuitionistic and Minimal Logic. [Report]
MoL-2013-10: Zhao, Zhiguang (2013) Algebraic Canonicity in Non-Classical Logics. [Report]
X-2013-01: Tzimoulis, Apostolos and Zhao, Zhiguang (2013) The Universal Model for the Negation-free Fragment of IPC. [Report]