van den Berg, H. F. (1998). Avantgarde und Anarchismus. Untersuchungen zur Bedeutung des Anarchismus in der Programmatik des Dadaismus in Zurich und Berlin. [Thesis, fully internal, Universiteit van Amsterdam].
Ducobu, H. (1998). The ecophysiology of a prochlorophyte and a cyanobacterium with emphasis on phosphorus metabolism. [Thesis, fully internal, Universiteit van Amsterdam].
Put, M. J. M. J. (1998). Innocent Farmers? A comparative evaluation into a government and an NGO project located in semi-arid Andhra Pradesh (India). [Thesis, fully internal, Universiteit van Amsterdam]. Thesis/Thela Publishers.
van Vlijmen, S. F. M. (1998). Algebraic specification in action. [Thesis, fully external, Univ. v. Utr.].
Kozlovsky, O. S. (1998). Structural stability in one-dimensional dynamics. [Thesis, fully internal, Universiteit van Amsterdam].
Rottschafer, V. (1998). Co-dimension 2 phenomena in pattern formation. [Thesis, fully external, Universiteit van Amsterdam]. Universiteit Utrecht.
van der Heyden, M. (1998). Non linear analysis of continuous and discrete physiological time sequences. [Thesis, fully external, University of Groningen]. Van der Heijden.
Colaris, W. J. J. (1998). Natuur van het Gooi; kansen voor duurzaam behoud. [Thesis, externally prepared, Universiteit van Amsterdam].
Helstone, F. S. (1998). Clinical Assessment for Psychotherapy; Qualitative-empirical and theoretical investigations. [Thesis, externally prepared, Universiteit van Amsterdam]. Faculteit der Psychologie.
Fijnvandraat, C. J. (1998). Consequences of hemophilia treatment. [Thesis, fully internal, Universiteit van Amsterdam].