The thesis was submitted in February 1994 to the Università degli studi di Napoli "Federico II". Dipartimento di Matematica e Statistica (University of Naples, Department of Mathematics and Statistics) and was prepared under the primary direction of Prof Luigi D'Ambra.
It is now freely available in PDF format,
which can be read with Adobe Acrobat Reader
In future, a single PDF file of the entire thesis may become available.
[Website and address Rosaria Lombardo]
P. M. Kroonenberg
Institute of Education and Child Studies, Leiden University
Wassenaarseweg 52, 2333 AK Leiden, The Netherlands
Tel. *-31-71-5273446/5273434 (secr.); fax *-31-71-5273945
E-mail: kroonenb at fsw.leidenuniv.nl