F. Benedix, M. Schilling, M. Schaller, M. Röcken, and T. Biedermann, “A Young Woman with Recurrent Vesicles on the Lower Lip: Fixed Drug Eruption Mimicking Herpes Simplex”, Acta Derm Venereol, vol. 88, no. 5, pp. 491–494, Jul. 2008.