@article{article,
title = {Nachruf},
author = {Koeppen,},
year = {1965},
journal = {Biomedizinische Technik/Biomedical Engineering},
volume = {10},
number = {1-4},
pages = {50-51},
howpublished = "\url{https://eurekamag.com/research/067/929/067929427.php}"
}