IAU Commission 45 (Stellar Classification)
IAU Working Group for Spectroscopic Data Archives
SSN, Standard Star Newsletter
Astronomical Spectra on the net
History of Astronomical Spectroscopy (1864 - 1940)
History
(D. Johnson)
SPECTRUM A PC-Based Stellar Spectral Synthesis Program
(R.O. Gray)
Spectroscopic Standards MSO
Articles on effective temperature calibrations
"Model Atmospheres Broad-Band Colors, Bolometric Corrections and
Temperature Calibrations for O - M Stars"
M. S. Bessell, F. Castelli, B. Plez, 1998, A&A 333, 231
RECONS (Research Consortium on Nearby Stars)