Alfonso, P., Martínez Cruz, M., Canet, C., Delgado, H., Fernández, E., & Sáenz, W. (2015). Sulphur isotopic composition of volcanic gases from Poás and Turrialba volcanoes, Costa Rica.

Alfonso, P., María Martínez Cruz, C. Canet, H. Delgado, Erick Fernández, y Wendy Sáenz. Sulphur Isotopic Composition of Volcanic Gases From Poás and Turrialba Volcanoes, Costa Rica. 2015.

Alfonso, P., et al. Sulphur Isotopic Composition of Volcanic Gases From Poás and Turrialba Volcanoes, Costa Rica. 2015.