1. http://near.jhuapl.edu/
2. http://www.macgraphic.co.jp/isas/
3. J. Kawaguchi, K. Uesugi, A. Fujiwara, H. Saitoh, The MUSES-C mission description and its status, Third IAA International Conference on Low-Cost Planetary Missions, IAA-L-98-0505, 1998.
4. An autonomous optical guidance and navigation around asteroids;Kawaguchi;Acta Astronautica,1999
5. S. Nakamura, T. Kubota, T. Hashimoto, K. Ninomiya, Motion estimation of unknown body based on optical information, Proceedings of the Sixth Workshop on Astrodynamics and Flight Mechanics, ISAS, 1996, pp. 54–59.