Tsutsumi M, Kamiya M, Sakamoto M, et al.: A ureteral small cell carcinoma mixed with malignant mesodermal and ectodermal elements: a clinicopathological, morphological and immunohistochemical study. Jpn J Clin Oncol 23: 325-329, 1993
Kim TS, Seong DH and Ro JY: Small cell carcinoma of the ureter with squamous cell and transitional cell carcinomatous components associated with ureteral stone. J Korean Med Sci 16: 796-800, 2001