@misc{heerens_punch_test_2001, 
author={Heerens, J.,Steglich, D.,Brocks, W.},
title={Punch Test for the Simulation of Ship's Hull Damage},
year={2001},
howpublished = {conference lecture: Freiburg (D); 24.-25.09.2001},
note = {Online available at: \url{} (DOI). Heerens, J.; Steglich, D.; Brocks, W.: Punch Test for the Simulation of Ship's Hull Damage. 13.deutschsprachiges ABAQUS Anwendertreffen. Freiburg (D), 2001.}}