@misc{schafstall_testing_and_1989, 
author={Schafstall, H.-G.},
title={Testing and development of underwater equipment},
year={1989},
howpublished = {conference lecture: Aberdeen (GB); 23.05.1989},
note = {Online available at: \url{} (DOI). Schafstall, H.: Testing and development of underwater equipment. Symposium „The Testing of Underwater Equipment“. Aberdeen (GB), 1989.}}