Anh Hong Nguyen, T. et al. 2017. 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, 3 (Jun. 2017). DOI:https://doi.org/10.18757/ejtir.2017.17.3.3204.