RECERCAT - Advanced Courses in Mathematics CRM Barcelona http://www.recercat.cat:80/handle/2072/198403 www.crm.cat/ca/Publications/Pagines/default.aspx Sat, 25 May 2013 14:59:28 GMT 2013-05-25T14:59:28Z The Channel Image http://www.recercat.cat:80/bitstream/id/51151/ http://www.recercat.cat:80/handle/2072/198403