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Amir T. Payandeh Najafabadi,  A Hyperexponential Approximation to Finite-Time and Infinite-Time Ruin Probabilities of Compound Poisson Processes.   journal   = {International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. January 2017, vol. 121(1). 18 - 25[viewed 24 September 2018]. Available from: http://waset.org/publications/10006198.