ACKNOWLEDGMENTS This work is essentially a revision of my Ph.D. thesis written at Washington University. I would like to express my sincere gratitude to my advisor Prof. Bjorn Jawerth for his guidance, his encouragement, and the generosity of his teaching. His help went many times beyond the professional level. I would like to express to Prof. Guido Weiss my appreciation of his careful reading of the manuscript of this thesis and his suggestions. I also want to thank Prof. Michael Frazier for some useful conversations and Prof. Mitchell Taibleson for some comments. My gratitude goes also to the Consejo Nacional de Investigaciones Cientificas y Tecnicas de Argentina, my professors at Universidad Nacional de Rosario, my parents, and all those who, in a way or another, helped me to come to Washington University. Finally, I would like to thank my wife Estela Gavosto for the unaccountably many things that we share, including mathematics, and, in particular, for her patience and her support while I was typing this thesis. VI
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