Oxholm, A, et al. “Keratinocyte-Expression of Interleukin-6 But Not of Tumour Necrosis Factor-Alpha Is Increased in the Allergic and the Irritant Patch Test Reaction”. Acta Dermato-Venereologica, vol. 71, no. 2, Jan. 1991, pp. 93-98, doi:10.2340/00015555719398.