1. Berman, W., Heymann, M. A., Whitman, V. and Rudolph, A. M. (1978). Dilatation of the ductus arteriosus by prostaglandin E1 in aortic arch abnormalities. Circulation, 58 (Suppl. 2), 44
2. Carlson, L. A., Ekelund, L. G. and Orö, L. (1969). Circulatory and respiratory effects of different doses of prostaglandin E1 in man. Acta Phi siol. Scand., 75, 161
3. Cassels, D. E. (1973). The Ductus Arteriosus, pp. 37–50 ( Springfield: Charles C. Thomas )
4. Challis, J. R. G., Dilley, S. R., Robinson, J. S. and Thorburn, G. D. (1976). Prostaglandins in the circulation of the foetal lamb. Prostaglandins, II, 1041
5. Challis, J. R. G., Hart, I., Louis, T. M., Mitchell, M. D., Jenkin, G., Robinson, J. S. and Thorburn, G. D. (1978). Prostaglandins in the sheep fetus: implications for fetal function. In: F. Coceani and P. M. Colley (eds.), Prostaglandins and Perinataal Medicine, Advances in Prostaglandin and Thromboxane Reseach, Vol. IV, pp. 115–132 ( New York: Raven Press )