@article{articlee3a008ab,
title   = {Quantitative Analysis of Placental Vasculature by Three-Dimensional Power Doppler Ultrasonography in Normal Pregnancies From 12 to 40 Weeks of Gestation},
author = {Paula, C. F. S. and Ruano, R. and Campos, J. A. D. B. and Zugaib, M.},
year = {2009},
doi = {10.1016/j.placenta.2008.11.010},
journal   = {Placenta}
}