Vasilev, P., et al. “Advanced Squamous Cell Carcinoma of the Skin Induced by Long-Term Hydroxyurea Treatment in a Patient With Essential Thrombocythemia”. Acta Medica Bulgarica, vol. 51, no. 2, June 2024, pp. 49-52, https://doi.org/10.2478/AMB-2024-0019.