After a long, long time I finally decided to translate my Ph.D. Thesis
into english. Although I think that nobody is interested anymore in the
results contained in it as they are outdated and, most of all, deal with
an out-of-fashion astronomical subject, it seemed to me that it's even
more useless to keep this work written in italian and closed in a
drawer.
So, here is the translation of the whole Ph.D. Thesis. It is divided in 9
sections (an Introduction and 8 Chapters) plus 6 Appendices.
The files are in Unix gzipped postscript format.
For any comment or trouble, please send me an e-mail.