@article{sunagua2020gradientes,
  author = "P. Suñagua",
  title = "Método de Gradientes Conjugados Precondicionado",
  year = 2020,
  journal = "Revista Boliviana de Matemática",
  publisher = "Carrera de Matemática - Universidad Mayor de San Andrés",
  volume = 4,
  number = 1,
  pages = "2-7",
  month = "Aug",
  url = "http://cmat.umsa.bo/revmat/rbm4/psunagua_gcp.pdf"
}