1. UBVRI passbands;Bessell;Publ. Astron. Soc. Pac.,1990
2. Colina, L., Bohlin, R., Castelli, F., 1996. Absolutely calibrated flux spectrum of Vega, STScI Instrument Science Report CAL/SCS-008, www.stsci.edu/ftp/cdgbs/cdbs2/calspec
3. Four-color and Hβ photometry for the brighter A0 stars;Crawford;Astron. Astrophys. Suppl.,1972
4. Keynote address: An historical review of solar variability, weather, and climate;Eddy,1983
5. Solar irradiance variation;Fröhlich,2003