@misc{luther_diving_operation_1989, 
author={Luther, G.},
title={Diving operation at great depth},
year={1989},
howpublished = {conference lecture: Wilhelmshaven (D); 16.-20.05.1989},
note = {Online available at: \url{} (DOI). Luther, G.: Diving operation at great depth. Symposium Marine Technology and Marine Science. Wilhelmshaven (D), 1989.}}