1. Hammar S, Bockus D, Remington F: Metastatic tumors of unknown origin: An ultrastructural analysis of 265 cases. Ultrastruct Pathol 11:209–250, 1987.
2. McDowell EM, Hess FG Jr, Trump BF: Epidermoid metaplasia, carcinoma in situ and carcinomas of the lung. In Trump BF, Jones RT, eds: Diagnostic Electron Microscopy, Vol 3. John Wiley and Sons, New York, 1980, 37–96.
3. Dickersin GR, Vickery AL, Smith SB: Papillary carcinoma of the thyroid, oxyphil cell type, “cell type” variant: A light-and electron-microscopic study. Am J Surg Pathol 4:501–509, 1980.
4. Johannessen JV, Sobrinho-Simoes M: The fine structure of follicular thyroid adenomas. Am J Clin Pathol 78:299–310, 1982.
5. Klinck GH, Oertel JE, Winship T: Ultrastructure of normal human thyroid. Lab Invest 22:2–22, 1970.