1. BERENSON M.M., RIDDELL R.H., PATH M.R.C., SKINNER D.B., FRESTON J.W. — Malignant transformation of esophageal columnar epithelium.Cancer, 1978,41, 554–561.
2. CRESPI M., GRASSI A., AMIRI G., MUNOZ N., ARAMESH B., MOJTABAI A., CASALE V. — Oesophageal lesions in Northern Iran: a premalignant condition?Lancet, 1979,2, 217–220.
3. Departments of Pathoanatomy, Honan Medical College and Peking Medical College, and Department of Pathology, Institute of Oncology, Chinese Academy of Medical Sciences, Peking. — Study on the morphologic characteristics of early squamous cell carcinoma of the esophagus.China’s Medicine, 1968,5, 297–304.
4. ENTWISTLE C.C., JACOBS A. — Histological Findings in the Paterson-Kelly syndrome.J. Clin. Pathol., 1965,18, 408–413.
5. FRIEDELL G.H. — Carcinoma, carcinoma in situ, and «early lesions» of the uterine cervix and the urinary bladder: introduction and definitions.Cancer Res., 1976,36, 2482–2484.