1. Lewis, J. H., H. G. Wells: J. Amer. med. Ass.78, 863 (1922).
2. Tassovatz, B., A. Kotsitch: Annals de Pédiatrie8, 285 (1961).
3. Crose, V. M.: In: The premature baby, p. 143 Churchill (London 1969).
4. Matta, L. J., J. J. Uruttia: Ann. N. Y. Acad. Scie.176, 93 (1971).
5. Mellander, O., B. Vahlquist, T. Melbin: Acta Paed.,48, suppl. 116 (1959).