1. www.rssb.co.uk
2. Welker E, Lipow M. Estimating the exponential failure rate from data with no failure events. In: Proceedings of the RAMS 1974. New York: IEEE Press; 1974.
3. Estimation from zero-failure data;Bailey;Risk Anal,1997
4. Experience rating and credibility;Buhlmann;ASTIN Bull,1967
5. Loss models: from data to decisions;Klugman,1997