@misc{heerens_method_of_2002, 
author={Heerens, J.,Schwalbe, K.-H.},
title={Method of Test for the Determination of Resistance to Stable Crack Extension using Specimens of Low Constraint},
year={2002},
howpublished = {conference lecture: Verdal (N); 23.-24.04.2002},
note = {Online available at: \url{} (DOI). Heerens, J.; Schwalbe, K.: Method of Test for the Determination of Resistance to Stable Crack Extension using Specimens of Low Constraint. 2nd International Symposium on High Strength Steel. Verdal (N), 2002.}}