Merger effect of two firms under network equilibrium. - Nobuo Matsubayashi; Masashi Umezawa; Yasushi Masuda; Hisakazu Nishino (Eur. J. Oper. Res., 2002)

NetMorph - an intuitive mobile object system. - Masashi Umezawa; Kazuhiro Abe; Satoshi Nishihara; Tetsuya Kurihara (C5, 2003)

A cost allocation problem arising in hub-spoke network systems. - Nobuo Matsubayashi; Masashi Umezawa; Yasushi Masuda; Hisakazu Nishino (Eur. J. Oper. Res., 2005)

Coalitionally strategy-proof social choice correspondences and the Pareto rule. - Masashi Umezawa (Soc. Choice Welf., 2009)

The replacement principle for the provision of multiple public goods on tree networks. - Masashi Umezawa (Soc. Choice Welf., 2012)

Ontology-Based Backward Learning Support System. - Masao Okabe; Masashi Umezawa; Takahira Yamaguchi (WCCE, 2017)