MEDINA, Abraham; 						LUNA, Erick; 						TREVIÑO, Cesar.
 On the vertical rotation of a sand heap.
<strong>CIENCIA ergo-sum</strong>, [S.l.], v. 2, n. 2, p. 217-222, oct. 2017.
ISSN 2395-8782.
Available at: &lt;<a href="https://cienciaergosum.uaemex.mx/article/view/7704" target="_new">https://cienciaergosum.uaemex.mx/article/view/7704</a>&gt;. Date accessed: 19 aug. 2026.