Reference List for the Small Main-Belt Asteroid Spectroscopic Survey (SMASS) bundle
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Chatfield, C., and A.J. Collins, Introduction to Multivariate Analysis, Chapman and Hall, New York, 1980.

Xu, S., R.P. Binzel, T.H. Burbine, and S.J. Bus, Small Main-belt Asteroid Spectroscopic Survey: Initial results, Icarus, 115, 1-35, 1995. doi:10.1006/icar.1995.1075