GNATEK, Adrian, OSICA, Piotr and JANAS-NAZE, Anna. Surgical management aspect of the patient with clear cell renal cell carcinoma metastasis to the upper lip - a case report. Journal of Education, Health and Sport. Online. 30 November 2017. Vol. 7, no. 11, pp. 294-308. [Accessed 29 June 2025].