O. Barndorff-nielsen, E. et H. Schmidli,, Saddlepoint approximations for the probability of ruin in finite time, Scandinavian actuarial journal , 1995(2), 1995, pp. 169-186
Saddlepoint techniques are applied to obtain approximations for the probability of ruin both in finite and in infinite time for the classical Cramér-Lundberg model. The resulting approximations are compared to exact values.