“MESENCHYMAL CHONDROSARCOMA OF THE HEAD AND NECK. AN OVERVIEW OF THE FEATURES, PROGNOSTIC FACTORS AND DIRECTIONS OF THE SEARCH FOR TREATMENT STRATEGIES. CLINICAL CASE” (2020) Voprosy onkologii, 66(4), pp. 420–424. doi:10.37469/0507-3758-2020-66-4-420-424.