1. Experience rating and credibility;H B�hlmann;Astin Bulletin,1967
2. Glaubw�rdigkeit f�r Schadens�tze;H B�hlmann;Bulletin of Swiss Association of Actuaries,1970
3. Geometrical credibility;De Vylder;Scandinavian Actuarial Journal,1976
4. Iterative credibility;De Vylder;Bulletin of Swiss Association of Actuaries,1977