@misc{markert_oekologisches_freilandpraktikum_1992, 
author={Markert, B.},
title={Oekologisches Freilandpraktikum},
year={1992},
howpublished = {lecture: Universitaet Osnabrueck;},
note = {Markert, B.: Oekologisches Freilandpraktikum. Universitaet Osnabrueck, 1992.}}