1. Anderson, J., C. E. Dent, C. Harper and C. R. Philpot: Lancet 1954 II, 720
2. Aub, J. C., W. Bauer, N. Ropes and C. Heath: Trans. Assoc. Amer. Physicians 42, 344 (1927).
3. Ball, W. A.: Lancet 1954 II, 243.
4. Bernheim-Karrer, J., u. G. Zaruski: Mschr. Kinderheilk. 42, 24 (1929).
5. Boddaert, J.: Rev. belge Path. 19, 27 (1950).