Other articles by Matthew J. Holman  Holman, M. 1995. The Distribution of Mass in the Kuiper Belt. Proceedings of the Twenty-seventh Symposium on Celestial Mechanics, January 10-11, 1995, eds. Hiroshi Kinoshita and Hiroshi Nakai. ps version Holman et al. 2004. Discovery of five irregular moons of Neptune. Nature 430, 865-867. pdf version