Reference List for the Small Solar System Objects Spectroscopic Survey bundle
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Hardorp, J.,
The sum among the stars. I. A search for solar spectral analogs.
Astronomy and Astrophysics 63, 383-390, 1978.

Lazzaro, D., C.A. Angeli, J.M. Carvano, T. Mothe-Diniz, R. Duffard, and M. Florczak, 
S3OS2: The visible spectroscopic survey of 820 asteroids, 
Icarus 172, 179-220, 2004. 
doi:10.1016/j.icarus.2004.06.006

Tüg, H., 
Vertical extinction on La Silla,
Messenger 11, 7-8, 1977.