@article{lopez2020teorema,
author = "H. D. Lopez",
title = "Teorema de Ptolomeo",
year = 2020,
journal = "Revista Boliviana de Matemática",
publisher = "Carrera de Matemática - Universidad Mayor de San Andrés",
volume = 4,
number = 1,
pages = "47-50",
month = "Aug",
url = "http://cmat.umsa.bo/revmat/rbm4/hlopez_geo.pdf"
}