6Edmonds J, Resner M S, Shkarlet K. Detection of precursor wear debris in lubrication systems[ A]. Aerospace Conference Proceedings, 2000 IEEE ,vol. 6[A]. 73 -77.
7Fitzgibbon K, Barker R, Clayton T, Wilson N. Failure-forecast method based on Weibull and statistical-pattern analysis[ A]. Reliability and Maintainability Symposium, Proceedings. Annual,2002[ C]. 516-521.