Kiyohito Utsunomiya, Nobuhiro Sanko, Chikako Keumi. Expectations and satisfaction towards railway companies by residents in Japan. Research in Transportation Economics. 2023. 100. 101303-101303
Chikako Keumi. Understanding the relationship between daily travel and long-term subjective well-being. Current Issues in Public Utilities and Public Policy: Empirical Studies Focusing on Japan. 2023. 149-190