In A., Brahic, J. C., Gérard, & J., Surdej (Eds.), "Observations and physical properties of small solar system bodies", 30th Liège International Astrophysical Colloquium, Institut d’Astrophysique, Liège (pp. 307-310). Liege, Belgium: University of Liege (1992).
"Observations and physical properties of small solar system bodies", 30th Liège International Astrophysical Colloquium, Institut d’Astrophysique, Liège, Liège, Belgium (June 1991)