Preface to the Second Edition ix clarify many points.My colleagues,such as Professor Emeritus Gerold (MPI Stuttgart/Germany),Professor Emeritus Petzow (MPI Stuttgart/Germany),Professor Emeritus Hench (Imperial College London),and Professors Ebrahimi,Sigmund,and Me- cholsky (University of Florida)helped with valuable suggestions which are much appreciated. Rolf E.Hummel Gainesville,FL June 2004Preface to the Second Edition ix clarify many points. My colleagues, such as Professor Emeritus Gerold (MPI Stuttgart/Germany), Professor Emeritus Petzow (MPI Stuttgart/Germany), Professor Emeritus Hench (Imperial College London), and Professors Ebrahimi, Sigmund, and Me￾cholsky (University of Florida) helped with valuable suggestions which are much appreciated. Rolf E. Hummel Gainesville, FL June 2004