@misc{michaelis_seminar_ueber_1991, 
author={Michaelis, W.},
title={Seminar ueber Umweltphysik},
year={1991},
howpublished = {lecture: Universitaet Hamburg;},
note = {Michaelis, W.: Seminar ueber Umweltphysik. Universitaet Hamburg, 1991.}}