A spectroscopic study of the Themis family M. Florczak, D. Lazzaro, T. Mothé-Diniz, C. A. Angeli and A. S. Betzler Astron. Astrophys. Suppl. Ser., 134 3 (1999) 463-471 Published online: 15 February 1999 DOI: 10.1051/aas:1999150