Devan Sohier Marc Bui Vu Duong Towards an Algortihm to Compute Safe Aircraft Trajectories. 11-14 2004 conf/rivf/2004 RIVF http://e-ifi.org/rivf/2004/proceedings/ArticlesRIVR_04/p11-14.pdf db/conf/rivf/rivf2004.html#SohierBD04