1. Bachmann u.Burghard, Z. Kinderheilk.39, 465 (1925).
2. Brouwer-Frommann, Ref. Zbl. Kinderheilk.19, 483 (1926).
3. Chievitz u.Meyer, Arch. Kinderheilk.66 (1918).
4. Cozzolino, Ref. Zbl. Kinderheilk.17, 278 (1925).
5. Feyrter, Frankf. Z. Path.35, 213 (1927).