@misc{gregory_titan_in_1988, 
author={Gregory, J. K.},
title={Titan in der Meerestechnik},
year={1988},
howpublished = {GKSS report},
note = {Online available at: \url{} (DOI). Gregory, J.: Titan in der Meerestechnik. GKSS 88-E-42. 1988.}}