Physical studies of asteroids - XXXIII. The spin rate of M-type asteroids C.-I. Lagerkvist, I. Belskaya, A. Erikson, V. Schevchenko, S. Mottola, V. Chiorny, P. Magnusson, A. Nathues and J. Piironen Astron. Astrophys. Suppl. Ser., 131 1 (1998) 55-62 Published online: 15 July 1998 DOI: 10.1051/aas:1998425