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Acknowledgments I thank my wife, Tahira, for critical reading of this monograph, 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 responses to my queries and professional manuscript handling. Akhlaq A. Farooqui xvii Acknowledgments