Jenniskens, P.; Betlem, H.; De Lignie, M.; Langbroek, M. (1997). “The Detection of a Dust Trail in the Orbit of an Earth-threatening Long-Period Comet”. Astrophysical Journal479: 441. Bibcode: 1997ApJ...479..441J. doi:10.1086/303853.
Jenniskens, P.; Betlem, H.; De Lignie, M.; Langbroek, M. (1997). “The Detection of a Dust Trail in the Orbit of an Earth-threatening Long-Period Comet”. Astrophysical Journal479: 441. Bibcode: 1997ApJ...479..441J. doi:10.1086/303853.