1. An approach to credibility in calculating IBNR for casualty excess reinsurance;G Benktander;The Actuarial Review,1976
2. The actuary and IBNR;R L Bornhuetter;Proc. CAS LIX,1972
3. Estimation of IBNR reserves by the methods chain ladder, Cape Cod and complementary loss ratio;H B�hlmann;International Summer School Leysin,1983