2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/165212This paper has been withdrawn by the author, since now all four parts of the review are available as a single file 0804.1639. I also made some revision of the text in order to avoid misprints and some inaccurate expressions.This paper has been withdrawnOther Condensed MatterMaterials Sciencetext