Ravelo Cabrera, Ivette, 		Moreira Osorio, Lesther, 		Arronte García, Miguel A., 		Ponce Cabrera, Luís V., AND 		Rodríguez González, Eugenio.
"Study of the Black Crusts in the Façade of the Cathedral of Havana Using Laser Induced Plasma Spectroscopy (LIBS)" <em>Revista Cubana de Física</em> [Online], Volume 28 Number 2 (15 December 2011)