1. 1) Brancati, cit. n. Appolant, Zeitschrif. f. Immunitätforsch. Bd. 17, 1913.
2. 2) Goldniann, Beiträge z. klin. Chir. Bd. 72, 1911.
3. 3) Levin, George Crocker Special Research Fund. 2, 1912.
4. 4) Woglom, Journ. of Exp. Medicine, Vol. 23, 1916.
5. 5) Levin, Journ. of Exp. Medicine, Vol. 16, 5912.