Sambade, C., Lé, F. S., & Sobrinho-Simões, M. (1988). Poorly differentiated and undifferentiated neoplasms of the thyroid gland. Clinico-pathologic, immunocytochemical and ultrastructural study. Acta Médica Portuguesa, 1(4-6), 251–259. https://doi.org/10.20344/amp.3573