R. Gutierrez et al., FIRST-PASSAGE-TIME DENSITIES FOR TIME-NON-HOMOGENEOUS DIFFUSION-PROCESSES, Journal of Applied Probability, 34(3), 1997, pp. 623-631
In this paper we study a Volterra integral equation of the second kind
, including two arbitrary continuous functions, in order to determine
first-passage-time probability density functions through time-dependen
t boundaries for time-non-homogeneous one-dimensional diffusion proces
ses with natural boundaries. These results generalize those which were
obtained for time-homogeneous diffusion processes by Giorno er al. [3
], and for some particular classes of time-non-homogeneous diffusion p
rocesses by Gutierrez ct al. [4], [5].