Abstract
The research in Zaragoza and Barcelona has been supported respectively by Grants 3380183, 409184, MAT88/0174, and MAT911681 from the Comision Asesora de Investigacion Cientifica y Tecnica of the Ministerio de Educacion y Ciencia. The research in Chicago has been supported by Grant DMR-8515224 and DMR-8815798 from the Solid State Chemistry Program, Division of Materials Research of the National Science Foundation. The cooperative work has been supported by Grant CCB-8504/001 from the American-Spain Joint Committee for Technical and Scientific Cooperation.
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