H.  Wang, Pallottino, L., and Bicchi, A., ?Controllability for Pairs of Vehicles Maintaining Constant Distance?, in IEEE International Conference on Robotics and Automation (ICRA2010), Anchorage, Alaska, 2010, pp. 342 - 349. 

H.  Wang, Pallottino, L., and Bicchi, A., ?Controllability Properties for Aircraft Formations?, in International Conference on Decision and Control - CDC 2010, 2010, pp. 2047 - 2054. 

H.  Wang, Pallottino, L., and Bicchi, A., ?Motion planning for Formations of Dubins Vehicles?, in International Conference on Decision and Control - CDC 2010, 2010, pp. 2263 - 2269.