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Santos PA, Barroso JG, Figueiredo AC, Pedro LG, Salgueiro LR, Fontinha SS, Deans SG, Scheffer JC 2005. Chemical polymorphism of populations of Thymus caespititius grown on the islands Corvo, Flores, São Miguel and Terceira (Azores) and on Madeira, assessed by analysis of their essential oils. Plant Sci 169: 1112-1117.