Agnieszka Mykowiecka, Katarzyna Głowińska, Piotr Rychlik, and Jakub Waszczuk. Construction of an electronic dictionary on the base of a paper source. In Zygmunt Vetulani, editor, Proceedings of the 5th Language & Technology Conference: Human Language Technologies as a Challenge for Computer Science and Linguistics, pages 506–510, Poznań, Poland, 2011.

Małgorzata Marciniak, Agnieszka Mykowiecka, and Piotr Rychlik. Medical text data anonymization. Journal of Medical Informatics & Technologies, 16:83–88, 2010.

Piotr Rychlik. Translating defaults into circumscription. IPI PAN Research Report 919, Institute of Computer Science, Polish Academy of Sciences, Warsaw, 2000.

Leonard Bolc, Krzysztof Dziewicki, Piotr Rychlik, and Andrzej Szałas. Wnioskowanie w logikach nieklasycznych. Automatyzacja wnioskowania. Akademicka Oficyna Wydawnicza RM, Warsaw, 1998.

Leonard Bolc, Krzysztof Dziewicki, Piotr Rychlik, and Andrzej Szałas. Wnioskowanie w logikach nieklasycznych. Podstawy teoretyczne. Akademicka Oficyna Wydawnicza RM, Warsaw, 1995.

Piotr Rychlik. Unifying Approach to Non-Monotonic Reasoning (Theory and Implementation). Ph.D. dissertation, Institute of Computer Science, Polish Academy of Sciences, Warsaw, 1992.

Piotr Rychlik. Some variations on default logic. In Proceedings of AAAI-91, pages 373–378, Anaheim, CA, 1991.

Piotr Rychlik. The generalized theory of model preference. In Proceedings of AAAI-90, pages 615–620, Boston, Massachusetts, 1990.

Piotr Rychlik. Multiple inheritance systems with exceptions. Artificial Intelligence Review, 3:159–176, 1989.

Piotr Rychlik. The use of modal default reasoning in information systems. International Journal of Man-Machine Studies, 22:507–522, 1985.