@article{liu_bardaka_palakurthy_tung_2020, title={Analysis of travel characteristics and access mode choice of elderly urban rail riders in Denver, Colorado}, volume={19}, ISBN={2214-3688}, DOI={10.1016/j.tbs.2020.11.004}, journal={TRAVEL BEHAVIOUR AND SOCIETY}, author={Liu, Chang and Bardaka, Eleni and Palakurthy, Ravikumar and Tung, Li-Wei}, year={2020}, month={Apr}, pages={194–206} }