1. ASTM E1316-07, Standard Terminology for Nondestructive Examinations.
2. Electric Contacts: Theory and Applications;Holm,1967
3. The Friction and Lubrication of Solids;Bowden,1986
4. Industrial Sensors and Applications for Condition Monitoring;Wild,1994
5. Mechanical Failures Prognosis through Oil Debris Monitoring;Beerbower,1975