Survival probabilities, the goal of risk theory / Hilary L. Seal. Seal, Hilary L. Risk (Insurance) HG8053 .S4 368 S438s Includes index. Bibliography: p. 97-100. Chichester ; New York : Wiley, c1978. c1978. 1978 Text x, 103 p. ; eng Wiley series in probability and mathematical statistics