H. Beyer, G. Czeplak, U. Terzenbach, and W. L. , Assessment of the method used to construct clearness index maps for the new European solar radiation atlas (ESRA) Solar Energy, pp.61-389, 1997.

R. Dogniaux, J. K. Page, L. Wald, M. Albuisson, G. Czeplak et al., Scientific advisors, European Solar Radiation Atlas, 2000.

M. Fontoynont, D. Dumortier, D. Heinemann, A. Hammer, J. Olseth et al., Satellight: a WWW server which provides high quality daylight and solar radiation data for Western and Central Europe, Proceedings of the 9 th Conference on Satellite Meteorology and Oceanography, pp.434-435, 1998.
URL : https://hal.archives-ouvertes.fr/hal-00472444

C. Rigollier and L. Wald, Using Meteosat images to map the solar radiation: improvements of the Heliosat method, Proceedings of the 9 th Conference on Satellite Meteorology and Oceanography, pp.432-433, 1998.
URL : https://hal.archives-ouvertes.fr/hal-00466623

C. Rigollier and L. Wald, The Helioclim Project, Proceedings of the ISES Solar World Congress 1999, pp.427-431, 1999.
DOI : 10.1016/B978-008043895-5/50064-3
URL : https://hal.archives-ouvertes.fr/hal-00465888