@misc{luther_hydrogen_as_1990, 
author={Luther, G.},
title={Hydrogen as energy source for lost bell situations},
year={1990},
howpublished = {conference lecture: Bergen (N); November 13-14, 1990},
note = {Online available at: \url{} (DOI). Luther, G.: Hydrogen as energy source for lost bell situations. NUTEC-FUDT-Seminar. Bergen (N), 1990.}}