1. Barcroft J. Researches on pre-natal life, vol. 1. Oxford: Blackwell Scientific Publications; 1946.
2. Dawes GS. Foetal and neonatal physiology. A comparative study of the changes at birth. Chicago: Year Book Medical Publishers Inc; 1968.
3. Longo LD, Eskes TKAB, editors. Classics in obstetrics and gynecology. Pearl River, NY: Parthenon Publishing Group; 1994.
4. Longo LD, Hewitt CH, Lorijn RHW, Gilbert RD. To what extent does maternal exercise affect fetal oxygenation and placental blood flow? Fed Proc. 1978;37:905.
5. Lorijn RHW, Longo LD. Clinical and physiologic implications of increased fetal oxygen consumption. Am J Obstet Gynecol. 1980;136:451–7.