Clode, N., Marques, J. P., Casal, E. and Graça, L. (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. Lisbon, Portugal, 5(1), pp. 1–3. doi: 10.20344/amp.3192.