1. S. P. Botkin, Clinical Lectures, St. Petersburgh (1888). In Russian.
2. I. V. Kolpakov, The Humoral Influence of the Spleen, Leningrad (1938). In Russian.
3. I. L. Faerman, Diseases of the Spleen, Moscow-Leningrad (1928). In Russian.
4. L. Asher and M. Dubois, Biochem. Ztschr. Bd. 82, S. 141–187 (1917).
5. L. Asher and H. Messerli, Biochem. Ztschr. Bd. 97, S. 40–56 (1919).