Highlights of the Part

In order not to discourage any impatient readers, we outline here the main steps of our investigation together with some of the major findings [1–19]. It has to be read “a la maniere” of a research physical paper. In other words, not many details are given. Explanations are limited and no backward motivation is given. It should be an incentive to plunge into the heart of the work contained in the following chapters.