@article{daoud_raïos_gharbia_gharbi_nguyen_1998,  title={Matter diffusion in hexagonal columnar phases},  volume={28},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97331998000400005},  DOI={10.1590/S0103-97331998000400005},  number={4},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Daoud, M. and Raïos, K. and Gharbia, M. and Gharbi, A. and Nguyen, H.T.},  year={1998},  month={Dec},  pages={284–300} }