@article{Babelon:2002Uq,
  author = "Babelon, Olivier  and  Ferreira, Luiz Agostinho",
  title = "{Integrability in higher dimensions: a model with exact Hopfion solutions }",
  doi = "10.22323/1.008.0003",
  journal = "PoS",
  year = 2002,
  volume = "unesp2002",
  pages = "003"
}