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3. On approximate computations when the corresponding characteristic functions are known;Esscher;Skandinavisk Aktuarietidskrift,1963
4. Approximations for compound Poisson and Pólya processes;Embrechts;Advances in Applied Probability,1985
5. Saddlepoint approximations to the distribution of the total claim amount in some recent risk models;Jensen;Scandinavian Actuarial Journal,1991