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Journal Article Some observations on the diagnosis of clinically pigmented skin tumours Get access M R Ewing, M R Ewing Departments of Surgery and Pathology in the Postgraduate Medical School of London Search for other works by this author on: Oxford Academic Google Scholar T Powell T Powell Departments of Surgery and Pathology in the Postgraduate Medical School of London Search for other works by this author on: Oxford Academic Google Scholar British Journal of Surgery, Volume 38, Issue 152, April 1951, Pages 442–454, https://doi.org/10.1002/bjs.18003815205 Published: 05 December 2005
Ewing et al. (Sun,) studied this question.