Use of PFGE (Pulsed Field Gel Electrophoresis) to trace the dissemination of Listeria monocytogenes in a Gravlax salmon processing line - Cruz, Cristina Durante; Franco, Bernadette Dora Gombossy de Melo; Landgraf, Mariza; Destro, Maria Teresa (Annual Meeting of the International Association for Food Protection, 2003)