@article{fournier_galatola_1998,  title={Bilayer membranes with 2D-nematic order of the surfactant polar heads},  volume={28},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97331998000400008},  DOI={10.1590/S0103-97331998000400008},  number={4},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Fournier, J.-B. and Galatola, P.},  year={1998},  month={Dec},  pages={329–338} }