On the maximum of a diffusion process in a random L\'evy environment
(統計物理の諸問題と確率論 1998)
加法過程の二つの極限定理について
(確率論とその周辺 1997)
Determination of the coefficients of asymptotic for exponential functionals of random walks with positive drifts
(Brownian motion and its related topics 1997)