Xu, W. , Yangyang, Y. , Ying, L. , Zhenzhen, W. (2013). 'Operational Analysis of Urban Intelligent Transportation System and Strategies for Future Development - Taking Calling Service of Taxi in Wuhan as an Example'. World Academy of Science, Engineering and Technology, Open Science Index 78, International Journal of Economics and Management Engineering, 7(6), 1540 - 1546.