Reference List for the Sawyer Asteroid Spectra bundle
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Hardorp, J. A. The sun among the stars. I. A search for solar spectral analogs.
Astron. Astrophys. 63, 383-390, 1978.

Hardorp, J., The sun among the stars.
V. A second search for solar spectral analogs. The Haydes distance. Astronomy
and Astrophysics, 105, 120-132, 1982.

Sawyer, Scott R., A high resolution CCD
spectroscopic survey of low albedo main belt asteroids, Ph.D. dissertation,
University of Texas at Austin, 1991.