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Ernesto Fernández, Wanda Quilhot, Cecilia Rubio, María Eliana Hidalgo, Rodrigo Diaz, Juan Ojeda "Effects of UV Radiation on Usnic Acid in Xanthoparmelia microspora (Müll. Arg. Hale)," Photochemistry and Photobiology, 82(4), 1065-1068, (1 July 2006)