1. Montagna W, editor. Morphology of ageing skin: The cutaneous appendages. In: Advances in Biology of Skin: Ageing. Vol. VI. Oxford: Pergamon Press; 1965. p. 1-16.
2. Bieber T. Other types of dermatitis. In: Burgdorf WH, Plewig G, Wolff HH, Landthaler M, editors. Braun-Falco's Dermatology. 3rd ed., Vol. I. Heidelberg: Springer; 2009. p. 425.