1. When does ruin occur in the collective theory of risk?;Segerdahl;Skandinavisk Aktuarietidskrift,1955
2. The moments of ruin time in the classical risk model with discrete claim size distribution;Picard;Insurance: Mathematics and Economics,1998
3. The moments of the time of ruin, the surplus before ruin, and the deficit at ruin;Lin;Insurance: Mathematics and Economics,2000