1. [1] Liu, X.F., Raorane, S. and Leu, M.: A Web-Based Intelligent Collaborative System for Engineering Design, Collaborative product design and manufacturing methodologies and applications, Li, W.D., Ong, S.K., Nee, A.Y.C. and McMahon, C. (Eds.), pp.37-58, Springer, London (2007).
2. [2] Toulmin, S.E.: The Uses of Argument, University Press, Cambridge, UK (1958).
3. [3] Duke, J. and Torres, V.: Multifactor productivity change in the air transportation industry, Monthly Labor Review, Vol.128, pp.32-45 (2005).
4. [4] Ball, M.O., Hoffman, R.L., Hall, W. and Muharremoglu, A.: Collaborative Decision Making in Air Traffic Management: A preliminary assessment, NEXTOR Technical Report (1998).
5. [5] Robyn, D.: Reforming the air traffic control system to promote efficiency and reduce delays, The Brattle Group (Oct. 2007).