@misc{ernst_modified_j_1988, 
author={Ernst, H. A.,Schwalbe, K.-H.,Hellmann, D.,McCabe, D. E.},
title={Modified J, JM, resistance curves under plane stress conditions},
year={1988},
howpublished = {journal article,GKSS report},
note = {Online available at: \url{} (DOI). Ernst, H.; Schwalbe, K.; Hellmann, D.; McCabe, D.: Modified J, JM, resistance curves under plane stress conditions. International Journal of Fracture. 1988. vol. 37, no. 2, 83-100.}}