The articles of this volume will not be reviewed individually. Contents: Takeshi {\it Kawazoe}, A relation between the logarithmic derivatives of Riemann and Selberg zeta functions and a proof of the Riemann hypothesis under an assumption on a discrete subgroup of $\text {SL} (2, {\bbfR})$ (1-13); Akira {\it Hori}, Andrianov’s $L$-functions associated to Siegel wave forms of degree two (Japanese) (14-25); Atsushi {\it Sakuramoto}, Extension of Jones’ projections (Japanese) (26-35); Kenji {\it Ueno}, Infinitesimal deformation of principal bundles, determinant bundles and affine Lie algebras (36-41); Gen {\it Kuroki}, Fock space representations of twisted affine Lie algebras (Japanese) (42- 49); Atsushi {\it Matsuo}, On integrable connections related to zonal harmonics (Japanese) (50-51); Satoshi {\it Naito}, Kostant’s; formula for a certain class of generalized Kac-Moody algebras. II (52-67); Hiroyuki {\it Yamane}, (Restricted) quantized enveloping algebras of simple Lie superalgebras and universal $R$-matrices (68-79); Tohru {\it Uzawa}, Real moment maps (80-83); Takashi {\it Hashimoto} and Ryuichi {\it Sawae}, A construction of solutions of the Ernst equations (84-90); Katsuhiro {\it Minemura}, Spherical sections of homogeneous vector bundles (Japanese) (91-97).