Kaufman, Benjamin, Abraham Leung, and Matthew Burke. “Evaluating Demand Responsive Transit Services Using a Density-Based Trip Rate Metric”. Journal of Transport and Land Use 14, no. 1 (April 14, 2021): 499–519. Accessed September 24, 2022. https://www.jtlu.org/index.php/jtlu/article/view/1796.