QUIÑONES GARZA, Huberto; 						PÁJARO HUERTAS, David.
 On the Mayan Cycle of 819 Days.
<strong>CIENCIA ergo-sum</strong>, [S.l.], v. 18, n. 3, p. 307-311, oct. 2017.
ISSN 2395-8782.
Available at: &lt;<a href="https://cienciaergosum.uaemex.mx/article/view/7066" target="_new">https://cienciaergosum.uaemex.mx/article/view/7066</a>&gt;. Date accessed: 19 aug. 2026.