Christian Veillet; Joel William Parker; Ian P. Griffin; Brian G. Marsden; Alain Doressoundiram; Marc W. Buie; David J. Tholen; Michael Connelley; Matthew J. Holman; The binary Kuiper-belt object 1998 WW31, Letters to Nature, Vol. 416, pp. 711–713 (April 18, 2002)