1. Abbot, C.G., Aldrich, L.B., Hoover, W.H.: 1942, Discussion of solar-constant values accuracy. Ann. Astrophys. Obs. Smithson. Inst. 6, 163 – 197.
2. Abbot, C.G., Fowle, F.E., Aldrich, L.B.: 1923, Ann. Astrophys. Obs. Smithson. Inst. 4, 217 – 257.
3. BenMoussa, A., Gissot, S., Schühle, U., Del Zanna, G., Auchère, F., Mekaoui, S., Jones, A.R., Walton, D., Eyles, C.J., Thuillier, G., Seaton, D., Dammasch, I.E., Cessateur, G., Meftah, M., Andretta, V., Berghmans, D., Bewsher, D., Bolsée, D., Bradley, L., Brown, D.S., Chamberlin, P.C., Dewitte, S., Didkovsky, L.V., Dominique, M., Eparvier, F.G., Foujols, T., Gillotay, D., Giordanengo, B., Halain, J.P., Hock, R.A., Irbah, A., Jeppesen, C., Judge, D.L., Kretzschmar, M., McMullin, D.R., Nicula, B., Schmutz, W., Ucker, G., Wieman, S., Woodraska, D., Woods, T.N.: 2013, On-orbit degradation of solar instruments. Solar Phys. doi: 10.1007/s11207-013-0290-z .
4. Cebula, R.P., Deland, M.T.: 1998, Comparisons of the NOAA-11 SBUV/2, UARS SOLSTICE, and UARS SUSIM MG II solar activity proxy indexes. Solar Phys. 177, 117 – 132.
5. Conscience, C., Meftah, M., Chevalier, A., Dewitte, S., Crommelynck, D.: 2011, The space instrument SOVAP of the PICARD mission. In: Proc. SPIE 8146. doi: 10.1117/12.895447 .