Kyounghee Kim, Moment Generating Function of the Reciprocal of an Integral of Geometric Brownian Motion, Proceedings of the American Mathematical Society, Vol. 132, No. 9 (Sep., 2004), pp. 2753-2759 ...

Professor C. C. Craig [1] has found the probability function of z = xy/σ1σ2 in closed form as the difference of two integrals. For purposes of numerical computation he has expanded this result in an ...