1. Bessau, G.—Montas. f. Kinder.,57: 162, 1933.
2. Karelitz, S.—Acta Ped.,16: 546, 1933.
3. Marriot, W. M.—Infant Nutrition, 2nd End., p. 269,C. V. Mosby Co., St. Louis, 1935.
4. Pfaundler, M. &Schlossmann, A.—Diseases of Children, Vol. IV, p. 111,J. B. Lippinicot Co., Philadelphia, 1935.
5. Tallermann, K.—Acta. Ped.,16: 560, 1933.