@misc{heerens_experimental_determination_2005, 
author={Heerens, J., Schoedel, M., Schwalbe, K.-H.},
title={Experimental Determination of Critical Crack Tip Opening Angle (CTOA) using the CTOD Delta 5 Measurement Technique},
year={2005},
howpublished = {conference lecture (invited): Turin (I);},
note = {Heerens, J.; Schoedel, M.; Schwalbe, K.: Experimental Determination of Critical Crack Tip Opening Angle (CTOA) using the CTOD Delta 5 Measurement Technique. 11th International Conference on Fracture, ICF 11. Turin (I), 2005.}}