1. A generalization of the collective theory of risk in regard to fluctuating basic probabilities;Ammeter H.;Skandinavisk Aktuarietidskrift,1948
2. Risk theory in a Markovian environment;Asmussen S.;Scandinavian Actuarial Journal,1989
3. Ruin Probabilities
4. Risk Theory in a Periodic Environment: The Cramér-Lundberg Approximation and Lundberg's Inequality