**Meet the editor**

Dimo I. Uzunov was born in 1950, Zlatograd, Bulgaria. He graduated from the Physics Faculty of St. Kliment Ohridski University of Sofia in 1974. He majored in condensed matter physics, with emphasis on theory of condensed matter. He received his PhD degree in Physics in 1981 and the degree of Doctor of Physical Sciences in 1988 from the G. Nadjakov Institute of Solid State Physics at the Bulgar-

ian Academy of Sciences (Sofia). He is a professor of Physics and the head of a research group at the G. Nadjakov Institute of Solid State Physics of the Bulgarian Academy of Sciences (Sofia). His research interests include condensed matter theory, statistical physics, field theory, phase transitions and critical phenomena, superconductivity, BEK and superfluidity, and magnetism.

## Contents

## **Preface XI**


