Zeta-functions, Lambert series and arithmetic functions analogous to Ramanujan's ...-function. I. Koji Katayama — 1974 Journal für die reine und angewandte Mathematik
Zeta-functions, Lambert series and arithmetic functions analogous to Ramanujan's ...-function. II. Koji Katayama — 1976 Journal für die reine und angewandte Mathematik
On Ramanujan's formula for values of Riemann zeta-function at positive odd integers Koji Katayama — 1973 Acta Arithmetica