Source: http://www.utc.fr/master-qualite/public/publications/qualite_et_biomedical/UTC/master_mts/2007-2008/stages/chtiha/rapport%20de%20stage%20MTS%2020072008%20CHTIHA%20HANANE/doc/Procedure%20de%20maintenance%20preventive%20et%20DQ%20des%20EB.pdf