On value-relations, functional relations and singularities of Mordell-Tornheim and related triple zeta-functions Kohji Matsumoto; Takashi Nakamura; Hiroyuki Ochiai; Hirofumi Tsumura — 2008 Acta Arithmetica
Absolute derivations and zeta functions. Kurokawa, Nobushige; Ochiai, Hiroyuki; Wakayama, Masato — 2003 Documenta Mathematica