"This is an extremely interesting book that consists of a set of articles based on the generalization of entropic measure introduced be C. Tsallis. [...] Topics examined in the book cover a wide variety of interesting material such as classical and quantum many body systems, thermodynamic systems, applications to spin glass models and to protein folding. All of these can be read even by the non-expert relatively easily after the basic concepts [...] have been assimilated. This is a book that will be useful to many people and I can positively recommend it." (Brian L. Burrows, Mathematical Reviews 2002m)