2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/142633This paper has been temporarily withdrawn for revision by the authors.29 pages, presented on Frankfurter Stochastik-Tage 2006, Frankfurt, 14-17.03.2006 and on The 5th Prague Summer School on Mathematical Statistical Mechanics, September 10-23, Prague, 2006 This paper has been temporarily withdrawn for revision by the authorsProbabilityMathematical Physics60K35, 82B44, 60F10text