@misc{stuhlmann_an_improvement_1990, 
author={Stuhlmann, R., Rieland, M., Raschke, E.},
title={An improvement of the IGMK model to derive total and diffuse solar radiation at the surface from satellite data},
year={1990},
howpublished = {GKSS report},
note = {Stuhlmann, R.; Rieland, M.; Raschke, E.: An improvement of the IGMK model to derive total and diffuse solar radiation at the surface from satellite data. Journal of Applied Meteorology. 1990. vol. 29, 568-603.}}