SALUD EN EL TRABAJO, Revista Red de Investigación en; 						VALVERDE-YÁÑEZ, Juan Manuel; 						LEÓN-UGALDE, Olga Yolanda.
 Permanent Disability for Lumbar Pathology in Workers Who Perform Manual Work in the “General Lázaro Cárdenas” Refinery” 2004-2009.
<strong>Network of Research in Occupational Health</strong>, [S.l.], v. 1, n. 1, p. 44, mar. 2018.
ISSN 2594-0988.
Available at: &lt;<a href="https://rist.zaragoza.unam.mx/index.php/rist/article/view/50" target="_new">https://rist.zaragoza.unam.mx/index.php/rist/article/view/50</a>&gt;. Date accessed: 25 feb. 2026.