@misc{schafstall_development_and_1989, 
author={Schafstall, H.-G.},
title={Development and safety aspects of future diving},
year={1989},
howpublished = {conference lecture: Marseille (F);},
note = {Schafstall, H.: Development and safety aspects of future diving. The Municipality of Marseilles and The Explorers Club Europe: International Symposium on Sea. Marseille (F), 1989.}}