Cruz-Aviña, Juan Ricardo, Laura G. Núñez-García, Rubén Cabrera, Jhoana Díaz-Larrea, and Elsa I. Castañeda-Roldan. 2021. “Microbiological and Physicochemical Quality of Water in Four Crater Lakes in the State of Puebla, Mexico”. Nexo Scientific Journal 34 (06):1632-48. https://doi.org/10.5377/nexo.v34i06.13124.