Zhu T, Z Juan and H Yao (2004). “Application of DEA on the Comprehensive Evaluation for Variable Speed Limits.? in Proceedings of the International Conference on Applications of Advanced Technologies in Transportation Engineering, American Society of Civil Engineers, Reston, VA 20191-4400, US: 621-625.

Zhu T, Z Juan and H Yao (2004). “Application of DEA on the Comprehensive Evaluation for Variable Speed Limits.? in Proceedings of the International Conference on Applications of Advanced Technologies in Transportation Engineering, American Society of Civil Engineers, Reston, VA 20191-4400, US: 621-625.

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