1. H. Asama, A. Matsumoto and Y. Ishida, Design of an Autonomous and Distributed Robot System: ACTRESS, Proc. of IEEE/RSJ Int. Workshop on Intelligent Robots and Systems, 1989, pp. 283–290.
2. H. Asama, K. Ozaki, H. Itakura, A. Matsumoto, Y. Ishida and I. Endo, Collision Avoidance among Multiple Mobile Robots based on Rules and Communication. Proc. of IEEE/RSJ Int. Workshop on Intelligent Robots and Systems, 1991, pp. 1215–1220.
3. Y. Ishida, S. Tomita, H. Asama, K. Ozaki, A. Matsumoto and I. Endo, Development of an Integrated Communication System for Multiple Robotic Agents, Proc. of Int. Symp. on Distributed Autonomous Robotic Systems, 1992, pp. 193–198.
4. K. Ozaki, H. Asama, Y. Ishida, A. Matsumoto, K. Yokota, H. Kaetsu and I. Endo, Proc. of IEEE/RSJ Int. Conf. on Intelligent Robots and Systems, 1993, pp. 1164–1169.
5. F. R. Noreils, Toward a Robot Architecture Integrating Cooperation between Mobile Robots: Application to Indoor Environment, The Int. Journal of Robotics Research, Vol. 12 No. 1, 1993, pp. 79–98.