1. B. P. Babkin, The External Secretion of the Digestive Glands, 1927 [In Russian].
2. I. P. Pavlov, Lectures on the Work of the Main Digestive Glands, 1897 [In Russian].
3. I. P. Razenkov, New Data on the Physiology and Pathology of Digestion, 1948 [In Russian].
4. A. M. Ugolev, Byull. Eksptl. Biol. i Med. No. 7 (1957). Original Russian pagination. See C. B. translation.
5. A. Bickel, and A. Katsch, Chirurgische Technik zur normalen and pathologischen Physiologie des Verdauungspparates.