1. Corker, K., Gore, B., Flemming, K., Lane, J., 2000. Free flight and the context of control: experiments and modeling to determine the impact of distributed air-ground air traffic management on safety and procedures. In: 3rd USA/Europe Air Traffic Management R & D Seminar, ATM-2000, Naples, Italy.
2. Kopardekar, P., Smith, N., Lee, K., Aweiss, A., Lee, P., Prevot, T., Mercer, J., Homola, J., Mainini, M., 2009. Feasibility of mixed equipage operations in the same airspace. In: 8th USA/Europe Air Traffic Management Research and Development Seminar, Napa, California.
3. Hoekstra, J., Ruigrok, R., van Gent, R., Visser, J., Gijsbers, B., Clari, M.V., Heesbeen, W., Hilburn, B., Groeneweg, J., Bussink, F., 2000. Overview of NLR Free Flight Project 1997–1999. Tech. Rep. NLR-TP-2000-227, NLR.
4. Airspace configuration concepts for next generation air transporation;Kopardekar;Air Traffic Control Quarterly,2008
5. Concept of Operations for the Next Generation Air Transportation System, 2007. Tech. Rep. Joint Planning and Development Office, Washington, DC, June 2007.