@article{reinaga2000piedras,
  author = "R. Reinaga",
  title = "De Piedras y Petreos",
  year = 2000,
  journal = "Revista de Matemática",
  publisher = "Carrera de Matemática - Universidad Mayor de San Andrés",
  volume = 2,
  number = 1,
  pages = "31-33"
}