@misc{_solar_radiation_1991, author={ title={Solar Radiation Atlas of Africa}, year={1991}, howpublished = {book}, note = {Online available at: \url{} (DOI). Raschke, E.; Stuhlmann, R.; Palg, W.; Steemers, T. (Ed.): Solar Radiation Atlas of Africa. Rotterdam: Balkema. 1991.}}