Marcos Marino, Full Professor, Department of Mathematics, University of Geneva
The book gives a good overview of the developments in the field, in which its author has himself played an important role. The book shows nicely how the different ideas are related, and how they can be combined to allow one to do very explicit calculations. * Marcel L. Vonk, Mathematical Reviews * ... very carefully written ... will inspire a wide range of physicists and mathematicians for a long period of time. * Albrecht Klemm, University of Wisconsin *