@misc{raschke_solar_und_1991, 
author={Raschke, E.},
title={Solar- und Windenergie},
year={1991},
howpublished = {lecture: Universitaet Hamburg; 1991},
note = {Online available at: \url{} (DOI). Raschke, E.: Solar- und Windenergie. Universitaet Hamburg, 1991.}}