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Nachbar, Franz and Stolz, Wilhelm and Merkle, Tanja and Cognetta, Armand B. and Vogt, Thomas and Landthaler, Michael and Bilek, Peter and Braun-Falco, Otto and Plewig, Gerd (1994) The ABCD rule of dermatoscopy. High prospective value in the diagnosis of doubtful melanocytic skin lesions. Journal of the American Academy of Dermatology 30 (4), pp. 551-559.