1. A Cook's tour of the finitary non-well-founded sets;Abramsky,2005
2. On modal systems having arithmetical interpretations;Avron;J. Symbolic Logic,1984
3. The method of hypersequents in the proof theory of propositional non-classical logics;Avron,1996
4. Kripke semantics for basic sequent systems;Avron,2011
5. A unified semantic framework for fully structural propositional sequent systems;Avron;ACM Trans. Comput. Log.,2013