To cite fobitools in publications use:

  Pol Castellano-Escuder, Raúl González-Domínguez, David S Wishart,
  Cristina Andrés-Lacueva, Alex Sánchez-Pla, FOBI: an ontology to
  represent food intake data and associate it with metabolomic data,
  Database, Volume 2020, 2020, baaa033,
  https://doi.org/10.1093/databa/baaa033

A BibTeX entry for LaTeX users is

  @Article{,
    title = {FOBI: An ontology to represent food intake data and associate it with metabolomic data},
    author = {{Castellano-Escuder} and {Pol} and {González-Domínguez} and {Raúl} and {Wishart} and David S and {Andrés-Lacueva} and {Cristina} and {Sánchez-Pla} and {Alex}},
    journal = {Database},
    year = {2020},
    volume = {2020},
    url = {https://academic.oup.com/database/article/doi/10.1093/databa/baaa033/5857401},
    doi = {10.1093/databa/baaa033},
  }