Bianchini, Walter Adriano, Albina Messias Altemani, and Jorge Rizzato Paschoal. 2003. “Undifferentiated Head and Neck Tumors: The Contribution of Immunohistochemical Technique to Differential Diagnosis”. São Paulo Medical Journal 121 (6):244-47. https://periodicosapm.emnuvens.com.br/spmj/article/view/2663.