@article{machicao2004simetria,
  author = "M. Machicao",
  title = "Simetría",
  year = 2004,
  journal = "Revista Boliviana de Matemática",
  publisher = "Carrera de Matemática - Universidad Mayor de San Andrés",
  volume = 3,
  number = 1,
  pages = "143-151"
}