1. Living with the sun's ultraviolet rays;Giese,1976
2. Des hyperkeratoses circonscrites;Dubreuilh;Ann Derm Syph (series 3),1896
3. Ultraviolet light and skin cancer;Findlay;Lancet,1928
4. The ultraviolet radiation of sunlight is a major factor in human cutaneous cancer;Blum;J Natl Cancer Inst,1940