@article{gennes1993,
  title={The Physics of Liquid Crystals},
  author={P. G. de Gennes and Jacques Prost},
  year={1993},
  doi={10.1093/oso/9780198520245.001.0001},
  url={https://doi.org/10.1093/oso/9780198520245.001.0001}
}