1. Luzhis, A. R.: Concerning the problem of uremic gastritis.Terapevtichesky arkhiv, 10, 35 (1971) (in Russian).
2. Luzhis, A. R.: Kidneys and gastrointestinal tract. In: Symptoms and Diagnosis of Renal Diseases. Meditsina, Leningrad 1974 (in Russian).
3. Ryss, E. S.: Anemia and Gastro-Intestinal Tract. Meditsina, Leningrad 1972 (in Russian).
4. Ryss, E. S.: On the nature and significance of gastric pathology involved in iron deficiency anemias.Terapevtichesky arkhiv, 1, 100 (1976) (in Russian).
5. Ryabov, S. I., Bondarenko, B. B.: Classification of renal failure. In: Chronic Renal Failure. Meditsina, Leningrad 1976 (in Russian).