3Tan Guang, Zhang Jun, Zhang Xuejun, et al. Concepts in Constructing CDM System [ C ]. China Proceedings of the 4th International Symposium onEiectronics in the Air Transport Industry, 8-9 January 2003.
4Michael Ball, Robert Hoffman, Thomas Vossen. Optimiza- tion and Mediated Bartering Models for Ground Delay Pro- grams[ A]. June 15, 2002.