5 Aug
2004
5 Aug
'04
11:41 p.m.
Some of you have remarked small mistakes. Here it is the correct version. Best regards Ramon -- ========================================================================= Ramon Puigjaner Universitat de les Illes Balears Departament de Ciencies Matematiques i Informatica 07122 PALMA (Spain) Phone: +34-971173288 Fax: +34-971173003 e-mail: putxi@uib.es =========================================================================