PP-2005-16: Beklemishev, Lev D. and Joosten, Joost J. and Vervoort, Marco (2005) A finitary treatment of the closed fragment of Japaridze's provability logic. [Report]
DS-2000-03: Vervoort, Marco (2000) Games, Walks and Grammars: Problems I've Worked On. Doctoral thesis, University of Amsterdam.