PT Journal AU Ye, Z Li, K Stapelbroek, M Savelsberg, R Gunther, M Pischinger, S TI Variable Step-Size Discrete Dynamic Programming for Vehicle Speed Trajectory Optimization SO IEEE transactions on intelligent transportation systems PY 2019 BP 476 EP 484 VL 20 IS 2 DI 10.1109/TITS.2018.2812921 LA english ER