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2. Yu. P. Kulel'. In the book: The Physiology and Pathology of the Intestine [in Russian], Moscow (1962), p. 22.
3. G. L. Mednik, Probl. Éndokrinol., No. 2, 40 (1957).
4. V. V. Nekachalov, Arkh. Pat., No. 2, 3 (1963).
5. N. P. Skakun, Probl. Éndokrinol., No. 3, 28 (1958).