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Rojas-Fernández, J.A., Balza-Quintero, A., Marcano, V., Rojas, P.A., Dávila-Vera, D., Peña-Contreras, Z., Mendoza-Briceño, R.V. and Palacios-Prü, E. 2008. Secondary metabolites of lichens in the snow zone of the Sierra Nevada in Mérida-Venezuela and their role in the absorption of ultraviolet radiation. Anales del Jardín Botánico de Madrid. 65, 1 (Jun. 2008), 59–72. DOI:https://doi.org/10.3989/ajbm.2008.v65.i1.246.