I consider this to be an excellent and surprisingly affordable text. Above and beyond the copious scientific content and the clear exposition, the authors and publisher have obviously been extremely careful in the production process-the equations and text appear essentially error-free. Anyone looking for a comprehensive and practical reference with respect to relativistic quantum theory will be well served by this volume. This book is an excellent guide to the theoretical background and the computational application of relativistic quantum chemistry. It lives up to the claim of being readable by the non-relativistic quantum chemist, and I can recommend it to anyone interested in using or developing these methods. Chemistry World