1. LAAS–CNRS, Université de Toulouse, CNRS, Toulouse, France
2. Robotics and Mechatronics Lab, Faculty of Electrical Engineering, Mathematics and Computer Science, University of Twente, Enschede, The Netherlands
3. Multi-Robot Systems Group, Faculty of Electrical Engineering, Czech Technical University in Prague, Czech Republic
4. Autonomous Systems Lab, Department of Mechanical and Process Engineering, ETH Zurich, Zürich, Switzerland