1. Aoyama, Acta Soc. ophthalm. jap.36, 1112 (1932).
2. Besredka, Ann. Inst. Pasteur35, 291 (1921).
3. Blumenthal, Dtsch. med. Wschr.50 I, 673 (1924).
4. Blumenthal u.Rohrschneider, Z. Augenheilk.76, 90 (1932).
5. Carrère, Ref. Zbl. Ophthalm.12, 350 (1924).