1. Soga, J.: Tratamiento del Cáncer Esophagico. In Diagnostico y Tratamiento de las Enfermedades del Tubo Digestivo Alto, P. Llorens, editor, Tokyo, Jpn. Internat. Cooperat. Agency, 1981, pp. 155–175
2. Fujimaki, M., Soga, J., Kawaguchi, M., Maeda, M., Sasaki, K., Tanaka, O., Muto, T.: Role of preoperative administration of bleomycin and radiation in treatment of esophageal cancer. Jpn. J. Surg.5:48, 1975
3. Fujimaki, M., Itoh, H., Tazawa, K., Saito, J., Shinbo, T., Fujita, T., Fumoto, K., Kawaguchi, M., Sasaki, K., Tanaka, O., Soga, J., Muto, T.: A study on pre- and post-operative combined treatment for esophageal cancer patients. Cancer Chemother. (Jpn)6:965, 1979
4. Soga, J., Fujimaki, M., Kawaguchi, M., Tazawa, K., Maeda, M., Sasaki, K., Omori, Y., Muto, T.: Bleomycin and irradiation effects on the esophageal carcinoma; A preliminary histological evaluation. Acta Med. Biol. (Niigata)19:119, 1971
5. Amano, T.: Clinico-pathological study on preoperative bleomycin therapy for epidermoid carcinoma of the esophagus. J. Jpn. Surg. Soc.72:803, 1971