This current draft of my Phd thesis is made available for public review, under a creative commons share-alike no-derivatives licence (http://creativecommons.org/licenses/by-nd/3.0/). Each completed chapter is included as a pdf. You may only share these documents as is, unaltered, with their licence page included. Do not copy, cite, quote or refer to any document here, or any content included in it.

This work has not been published in peer-reviewed medium, nor has it been submitted for examination. It therefore is very likely to contain substantial mistakes.

Once the thesis is approved, it will be republished under a revised licence. 

Yishay Mor, phd@yishaymor.org

Version 0.9, 1 Sep. 09

Your comments will be appriciated