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Engel, E. and Ulrich, H. and Vasold, R. and König, B. and Landthaler, M. and Süttinger, R. and Bäumler, W. (2008) Azo Pigment and a Basal Cell Carcinoma at the Thumb. Dermatology 216, pp. 76-80.
Engel, E. and Santarelli, F. and Vasold, R. and Ulrich, H. and Maisch, T. and König, B. and Landthaler, M. and Gopee, N. V. and Howard, P. C. and Bäumler, W. (2006) Establishment of an Extraction Method for the Recovery of Tattoo Pigments from Human Skin Using HPLC Diode Array Detector Technology. Anal. Chem. 78, 6440 - 6447.
Vasold, R. and Naarmann, N. and Ulrich, H. and Fischer, D. and König, B. and Landthaler, M. and Bäumler, W. (2004) Tattoo Pigments are Cleaved by Laser Light – The Chemical Analysis In Vitro Provide Evidence for Hazardous Compounds. Photochem. Photobiol. 80, 185 – 190.