1. Beahrs, O.H., Henson, D.E., Hutter, R.V.P., Myers, M.H. (editors): American Joint Committee on Cancer Manual for Staging of Cancer, 3rd edition, Philadelphia, J.B. Lippincott Co., 1988, pp. 63–67
2. Skinner, D.B., Little, A.G., Ferguson, M.K., Soriano, A., Staszak, V.M.: Selection of operation for esophageal cancer based on staging. Ann. Surg.204:391, 1986
3. Lehr, L., Rupp, N., Stier, A., Siewert, J.R.: Preoperative evaluation of resectability of esophageal cancer by CT and MR imaging. In Diseases of the Esophagus, J.R. Siewert, A.H. Holscher, editors, Springer-Verlag, Berlin, Heidelberg, New York, Tokyo, 1988, pp. 146–148
4. Murata, Y., Muroi, M., Yoshida, M., Ide, H., Hanyu, F.: Endoscopic ultrasonography in the diagnosis of esophageal carcinoma. Surg. Endosc.1:11, 1987
5. Tio, T.L., Coene, P.P.L.O., den Hartog Jager, F.C.A., Tytgat, G.N.J.: Preoperative TMN classification of esophageal carcinoma by endosonography. Hepatogastroenterology37:376, 1990