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O. Pelka, F. Nensa, and C. M. Friedrich, "Adopting semantic information of grayscale radiographs for image classification and retrieval," in BIOSTEC 2018 : Proceedings of the 11th International Joint Conference on Biomedical Engineering Systems and Technologies, Setúbal: SCITEPRESS - Science and Technology Publications, Lda, 2018, pp. 179-187.