Rosas, I., G. Roy Ocotla, P. Mosiño, A. Baez, and L. Rivera. “Abundance and Heterogeneity of Algae in the Mexico City Atmosphere”. Geofisica Internacional, vol. 26, no. 3, July 1987, pp. 359-73, doi:10.22201/igeof.00167169p.1987.26.3.1310.