Clode, N, J P Marques, E Casal, and L Graça. 1992. “Relationship Between the Steuart Resistance Index of the Umbilical Artery in Non-Pathologic Pregnancy and the Weight and Ponderal Index of the Newborn”. Acta Médica Portuguesa 5 (1). Lisbon, Portugal:1-3. https://doi.org/10.20344/amp.3192.