M. Bhatia, M. Patil, C. Woolsey, B. Stanford, and P. Beran. AIAA Atmospheric Flight Mechanics Conference, Minneapolis, US-MN, American Institute of Aeronautics and Astronautics, (August 2012)
Z. Khan, and S. Agrawal. Proceedings of the 2007 American Control Conference, page 5284--5289. New York, US-NY, Institute of Electrical and Electronics Engineers, (July 2007)
X. Deng, L. Schenato, and S. Sastry. Proceedings of the 2003 IEEE International Conference on Robotics & Automation, page 1152-1157. Taipei, TW, Institute of Electrical and Electronics Engineers, (September 2003)