The PhD Thesis (supervisor: Prof. P. Wentzell)
is available in PDF-format,
which can, for instance, be read with Adobe Acrobat Reader or GhostScript.
Separate chapthers of this thesis have been published or are under review, generally in a slightly revised form,
and with the figures in black and white. Their colour versions are contained in the
present PDF-file. The software for some of the procedures may be obtained from the author, Dr. Lorenzo J. Vega
Montoto.
The thesis is only available as a single PDF file of the entire document.
P.M. Kroonenberg
Leiden Institute of Education and Child Studies, Leiden University
Wassenaarseweg 52, 2333 AK Leiden, The Netherlands
E-mail: kroonenb at fsw.leidenuniv.nl