1. Collision avoidance among multiple robots using virtual impedance;Arai,1989
2. From Tom Thumb to the Dockers: Some experiments with foraging robots;Drogoul,1992
3. Minimizing complexity in controlling a mobile robot population;Mataric,1992
4. Motion planning of multiple mobile robots using dynamic groups;Ota,1993
5. Dynamic grouping in multiple mobile robots system;Ota,1993