Neves, J., A. Brasileiro, and P. Mendes-Bastos. “Recalcitrant Palmoplantar Pustulosis: Have You Considered Allergic Contact Dermatitis?”. Journal of the Portuguese Society of Dermatology and Venereology, Vol. 79, no. 2, June 2021, pp. 173-4, doi:10.29021/spdv.79.2.1313.