D.  Lee, Franchi, A., Son, H. Il, Bülthoff, H. H., and Giordano, P. Robuffo, ?Semi-Autonomous Haptic Teleoperation Control Architecture of Multiple Unmanned Aerial Vehicles?, IEEE/ASME Transaction on Mechatronics, Focused Section on Aerospace Mechatronics, vol. 18, pp. 1334-1345, 2013.