1. 2Hoekstra, J., Ruigrok, R., van Gent, R., Visser, J., Gijsbers, B., Valenti, M., Heesbeen, W., Hilburn, B., Groeneweg, J., and Bussink, F. “Overview of NLR Free Flight Project 1997-1999,” Tech. Rep. NLR-CR-2000-227, National Aerospace Laboratory (NLR), May 2000.
2. A review of conflict detection and resolution modeling methods