"It is a laudable effort by Hettema to select, introduce and translate a well chosen set of papers by pioneers in the field from the original German into English and to make them available to a wider readership "Int. J. Quantum Chemistry, 2000"It will have a lasting value for theoretical chemists and science historians".Structural Chemistry, 2000" is a finely produced, useful, and highly thought-provoking book".Physics Today, 2001