Overview of NLR Free Flight Project 1997-1999 - Hoekstra, J.M.; Ruigrok, R.C.J.; Gent, R.N.H.W. van; Visser, J.M.P.C.M.; Gijsbers, B.; Valenti Clari, M.S.V.; Heesbeen, W.W.M.; Hilburn, B.G.; Groeneweg, J. (National Aerospace Laboratory NLR, 2000)
Keywords: Air traffic control; Flight safety