• Ryszard Wojciki  “Kazimierz Ajdukiewicz's Theory of Meaning”, The Second Summer School for Theory of Knowledge, Madralin, 10-19 August 1999
  • Jaakko Hintikka  “How Can a Phenomenologist Have a Philosophy of Mathematics?”, Phenomenology and Mathematics, the University of Tampere, Finland, MAY 21-23, 2007
  • “Publications by Dagfinn Follesdal”