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Preface This monograph is derived, with only minor typographical revisions, from my University of Edinburgh doctoral thesis [Rus98b], examined in 1998. For better or worse, I decided to leave the main body of the work unchanged and to exclude any account of subsequent related research. However, I have added an epilogue, not contained in [Rus98b] , that relates the thesis to my more recent work on elaborating and implementing my proposed extensions to Modules in Moscow ML [RRS00], a widely useddoi:10.1016/s1571-0661(05)82621-0 fatcat:vbz7dhknzvagjakd5ox6eowifa