Sinonasal Undifferentiated Carcinoma, Nasopharyngeal-Type Undifferentiated Carcinoma, and Keratinizing and Nonkeratinizing Squamous Cell Carcinoma Express Different Cytokeratin PatternsAlessandro Franchi, Marco Santucci, Daniela Massi et al.|The American Journal of Surgical Pathology|2002Cited by 130