1. Teal group predicts worldwide uav market will total $91 billion in its 2014 uav market profile and forecast. http://tealgroup.com/index.php/about-teal-group-corporation/press-releases/ 118-2014-uav-press-release. TEAL GROUP.
2. MA Bedford. Unmanned aircraft system (uas) service demand 2015-2035.
3. Survey of Numerical Methods for Trajectory Optimization