T. Nilsen et J. Paulsen, ON THE DISTRIBUTION OF A RANDOMLY DISCOUNTED COMPOUND POISSON-PROCESS, Stochastic processes and their applications, 61(2), 1996, pp. 305-310
We study the distribution of the stochastic integral integral(0)(infin
ity) e(-Rt) dP(t) where R is a Brownian motion with positive drift and
P is an independent compound Poisson process. We show that in the spe
cial case when the jumps of P are exponentially distributed, the integ
ral has the same distribution as that of a gamma variable divided by a
n independent beta variable.