Two identities for lattices, distributive lattices and modular lattices with a constant. - Saburo Tamura (Notre Dame J. Formal Log., 1975)

Enumeration of digraphs with given number of vertices of odd out-degree and vertices of odd in-degree. - Shinsei Tazawa; Teruhiro Shirakura; Saburo Tamura (Discret. Math., 1991)