Pérez-Ramos O, Nestell M. Permian fusulinids from Cobachi, central Sonora, Mexico. revmexcg [Internet]. 2018 Jun. 19 [cited 2025 Jun. 9];19(1):25-37. Available from: https://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/983