@misc{heerens_results_of_1988, 
author={Heerens, J., Cornec, A., Schwalbe, K.-H.},
title={Results of a round robin on stretch zone width determination},
year={1988},
howpublished = {GKSS report},
note = {Heerens, J.; Cornec, A.; Schwalbe, K.: Results of a round robin on stretch zone width determination. Fatigue and Fracture of Engineering Materials and Structures. 1988. vol. 11, no. 1, 19-29.}}