Grav, Tommy; Holman, Matthew J.; Gladman, Brett J.; Aksnes, KaarePhotometric survey of the irregular satellites, Icarus, 166,(2003), pp. 33-45. Preprint
David Nesvorný, Cristian Beaugé, and Luke Dones
Collisional Origin of Families of Irregular Satellites, The Astronomical Journal, 127 (2004), pp. 1768–1783 (pdf).