@article{akpama_ben bettaieb_abed-meraim_2016,  title={Influence of the Yield Surface Curvature on the Forming Limit Diagrams Predicted by Crystal Plasticity Theory},  volume={13},  ISSN={1679-7825},  url={https://doi.org/10.1590/1679-78252456},  DOI={10.1590/1679-78252456},  number={12},  journal={Latin American Journal of Solids and Structures},  publisher={Individual owner},  author={Akpama, H.K. and Ben Bettaieb, M. and Abed-Meraim, F.},  year={2016},  month={Dec},  pages={2231–2250} }