Pérez-Segura, Efrén, et al. “La Esperanza: A New Mineralization With Ni–Co in Sonora, Mexico”. Revista Mexicana De Ciencias Geológicas, vol. 21, no. 2, May 2018, pp. 260-7, https://rmcg.unam.mx/index.php/rmcg/article/view/892.