@article{Tu.etal:2009,
  title={Return mapping for nonsmooth and multiscale elastoplasticity},
  author={Tu, Xuxin and Andrade, Jos{\'e} E and Chen, Qiushi},
  journal={Computer Methods in Applied Mechanics and Engineering},
  volume={198},
  number={30},
  pages={2286--2296},
  doi={10.1007/s11440-013-0276-x},
  year={2009},
  publisher={Elsevier}
}