1. Aliseda-Llera, A.: Seeking Explanations: Abduction in Logic, Philosophy of Science and Artificial Intelligence. PhD thesis, ILLC (1997)
2. van Benthem, J.F.A.K.: Questions about Quantifiers. Journal of Symbolic Logic 49, 447–478 (1984)
3. van Benthem, J.F.A.K.: Essays in Logical Semantics. Reidel, Dordrecht (1986)
4. van Benthem, J.F.A.K.: Language in Action. North-Holland, Amsterdam (1991)
5. Bernardi, R.: Reasoning with Polarity in Categorial Type Logic. PhD thesis, Utrecht University (2002)