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By
E. Arrondoe,
I. Sols, Departamento de Algebra Facultad de Ciencias Matemáticas Universidad Complutense 28040 Madrid, Spain
Edited by
G. Ellingsrud, Universitetet i Bergen, Norway,C. Peskine, Université de Paris VI (Pierre et Marie Curie),G. Sacchiero, Università degli Studi di Trieste,S. A. Stromme, Universitetet i Bergen, Norway