Thanks to the exceptional clarity of the presentation, the meticulous attention to the subtleties of the calculations can be appreciated both by researchers who... » 

Thanks to the exceptional clarity of the presentation, the meticulous attention to the subtleties of the calculations can be appreciated both by researchers who are experts in the subject and by graduate students who are approaching this field with minimum background knowledge. Anyone who is interested in this subject should read this book carefully. Diego N. Pelliccia for Mathematical Reviews «