@article{legoll_2004,  title={Numerical homogenization of nonlinear viscoplastic two-dimensional polycrystals},  volume={23},  ISSN={1807-0302},  url={https://www.scielo.br/j/cam/a/xRVPCc5CtMYV6Dt8FfDQ4Sc/},  number={2-3},  journal={Computational & Applied Mathematics},  publisher={Sociedade Brasileira de Matemática Aplicada e Computacional},  author={Legoll, Frédéric},  year={2004},  month={May},  pages={309–325} }