The firs t author (Gerald W. Johnson) was supported in part by the National Science Foundation under Grant DMS-8403197. The second author (Michel L. Lapidus) was partially supported by a Grant from the Faculty Research and Innovation Fund at the University of Southern California as well as National Science Foundation Grant DMS-8120790. He was a member of the Mathematical Sciences Research Institut e at Berkeley and a Visiting Faculty member at the University of Nebraska at Lincoln while much of this work was accomplished. He would like to dedicate this memoir to his parents, Myriam and Serge Lapidus, on the occasion of their sixtieth birthday.
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