Martzloff, Jean-Claude. “Metonic Cycles, Classical and Non-Classical, and Chinese Calendrical Calculations (104 BC - 618 AD)”. CUBO, A Mathematical Journal 6, no. 2 (August 1, 2004): 53–77. Accessed May 20, 2024. https://cubo.ufro.cl/ojs/index.php/cubo/article/view/1640.