@Article{ 
  CoGiGiPi23,
  author = { Corona, Dario and Giambò, Roberto and Giannoni, Fabio and Piccione, Paolo },
  title = { On the relative category in the brake orbits problem },
  journal = { Topological Methods in Nonlinear Analysis },
  year = { 2023 },
  doi = { 10.12775/TMNA.2022.057 },
  volume = { 61 },
  pages = { 199--215 },
  URL = { http://cvgmt.sns.it/paper/6487/ },
  note = { cvgmt preprint}
}