Corona-Esquivel, Rodolfo, et al. “Mineralogical Study of the La Hueca Cretaceous Iron-Manganese Deposit, Michoacán, South-Western Mexico”. Revista Mexicana De Ciencias Geológicas, vol. 17, no. 2, July 2018, pp. 142-51, https://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/1010.