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xix Acknowledgments I thank my wife, Tahira, for critical reading of this monograph and offering valuable advice, useful discussion, and evaluation of subject matter. Without her help and participation, this monograph neither could nor would have been completed. I would also like to express my gratitude to Melanie Tucker and Kristi Anderson of Elsevier/Academic Press for their quick re- sponses to my queries and professional manuscript handling. I would like to thank production manager Stalin Viswanathan for his help, patience, and cooperation in the production of this monograph and Alan Studholme for designing the cover page. Acknowledgments