Departamento de Algebra, Universidad Complutense de Madrid, 28040 Madrid, Spain
J. M. Gamboa
Affiliation:
Departamento de Algebra, Universidad Complutense de Madrid, 28040 Madrid, Spain
G. Gromadzki
Affiliation:
Instytut Matematyki WSP, Chodkiewicza 30, 85-064 Bydgoszcz, PolandCurrent address: Instytut Matematyki, University of Gdańsk, Wita Stwosza 57, 80-952 Gdańsk, Poland.
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