1. Gold P, Freedman SO: Demonstration of tumor specific antigens in human colonic carcinomata by immunological tolerance and absorption techniques. J Exp Med 121: 439–459, 1965
2. Araki A, Kawaharada M, Yachi A, Wada T: Clinical studies on carcinoembryonic antigen (CEA, Gold) with reference to its diagnostic significance in cancer of digestive organs. Jpn J Gastroenterol 73: 384–393, 1976
3. Hirai H: CEA (1) —Assay method and its clinical application-Jpn J Clin Med 34: 1274–1279, 1976
4. Hirai H: CEA (2) —Assay method and its clinical application-Jpn J Clin Med 34: 1486–1491, 1976
5. Yachi A, Araki A, Kawaharada M, Imai K, Abe H, Akahonai Y, Wada T: Carcinoembryonic antigen and the related antigens in gastric carcinoma. Protides of Biological Fluids 24: 473–476, 1976