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Acknowledgements Our special thanks go to Mrs. Susie Compton who has managed the whole manuscript and the authors. R.J.P. Williams acknowledges the continued support of the Inorganic Chemistry Laboratory, Oxford University and in his career of Wadham College, Oxford and of The Royal Society. J.J.R. Fraústo da Silva acknowledges the Foundation for Science and Technology, Ministry for Science and Technology Portugal, for general support of research activi- ties. Special thanks are due to Dr. Marina Fraústo da Silva and Eng. José Nascimento for the reproduction and redrawing of most figures of the book, and to Mrs. Teresa Maria Carreiras da Silva and Miss Cristina Sequeira da Silva for proficient secretarial assistance and concomitant considerable patience. ELSE_WDSB_Ackno.qxd 10/1/2005 3:13 PM Page v v