“Khipu UR19: Inca Measurements of the Moon’s Diameter and Its Distance from the Earth”. 2014. Revista Latinoamericana De Etnomatemática Perspectivas Socioculturales De La Educación Matemática 7 (1): 96-125. https://revista.etnomatematica.org/index.php/RevLatEm/article/view/106.