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Pereira SI, Santos PA, Barroso JG, Figueiredo AC, Pedro LG, Salgueiro LR, Deans SG, Scheffer JC 2003. Chemical polymorphism of the essential oils from populations of Thymus caespititius grown on the islands Pico, Faial and Graciosa (Azores). Phytochem Anal 14: 228-231.