Praise for 'Theory of Evolution and Relaxation of Multi-Spin Systems':". it provides a lucid and systematic development of a very complex area of modern theory involving spin dynamics driven by complex, non-commuting hamiltonians. These phenomena are of fundamental importance in NMR, NQR and ESR spectroscopies.""The monograph will be extremely useful both in graduate education and in on-going research.""Dr. Kruk's manuscript is an extremely valuable contribution to our field and is written at the highest level of professional scholarship.""The general scholarly quality and the theoretical level are both very high, thus providing a unique resource to the research community.""Dr. Kruk succeeded to write a comprehensive representation of the theoreticalbackground of spin relaxation. There is no other treatise on magnetic resonance on the market with this multidisciplinary comprehensiveness, clarity of treatment andsystematic analysis of spin relaxation."