Labunski, S., Posern, G., Ludwig, S., Kundt, G., Bröcker, E.-B., & Kunz, M. (2001). Tumour necrosis factor-alpha promoter polymorphism in erythema nodosum. Acta Dermato-Venereologica, 81(1), 18–21. https://doi.org/10.1080/00015550116912