@misc{petri_crack_tip_2009, 
author={Petri, N., Xu, S., Tyson, W.R., Martin, P.},
title={Crack tip opening angle testing of sheet materials for automotive applications},
year={2009},
howpublished = {report part},
abstract = {straight and the CTOA measurement method described in the standard was found suitable.},
note = {Petri, N.; Xu, S.; Tyson, W.; Martin, P.: Crack tip opening angle testing of sheet materials for automotive applications. In: CANMET Materials Technology Laboratory. 2009.}}