1. Primitive Neuroectodermal Tumors and Other Sarcomas of the Kidney
   Leonardo D. Borregales et al, 2016, Rare Genitourinary Tumors CrossRef
2. Large hemangiopericytoma of the pelvis—towards a multidisciplinary approach
   Mohammad Fard-Aghaie et al, 2015, World Journal of Surgical Oncology CrossRef