@misc{penndorf_kerntechnik__1990, 
author={Penndorf, K.},
title={Kerntechnik},
year={1990},
howpublished = {lecture: Fachhochschule Luebeck; WS 1984-1985, SS 1990},
note = {Online available at: \url{} (DOI). Penndorf, K.: Kerntechnik. Fachhochschule Luebeck, 1990.}}