1. Cutaneous squamous-cell carcinoma;Alam,2001
2. Quantitative aspects of ultraviolet erythema;Diffey,1991
3. Quantitative studies on cutaneous erythema induced by ultraviolet radiation;Farr,1984
4. Skin colour typology and suntanning pathways;Chardon,1991
5. Guidelines for the measurement of skin colour and erythema;Fullerton,1996