Anh Hong Nguyen, Thi, Makoto Chikaraishi, Hajime Seya, Akimasa Fujiwara, and Junyi Zhang. “Elderly’s Heterogeneous Responses to Topographical Factors in Travel Mode Choice Within a Hilly Neighborhood: An Analysis Based on Combined GPS and Paper-Based Surveys”. European Journal of Transport and Infrastructure Research 17, no. 3 (June 1, 2017). Accessed June 17, 2024. https://journals.open.tudelft.nl/ejtir/article/view/3204.