@misc{holthaus_the_use_1988, 
author={Holthaus, J.},
title={The use of hydrogen in future manned diving technology},
year={1988},
howpublished = {conference lecture: Naples (I); June 6-9, 1988},
note = {Online available at: \url{} (DOI). Holthaus, J.: The use of hydrogen in future manned diving technology. Biennale Internazionale del Mare. Naples (I), 1988.}}