1. Andonotopo, W., & Kurjak, A. (2006). The assessment of fetal behavior of growth restricted fetuses by 4D sonography. Journal of Perinatal Medicine, 34, 471–478.
2. Azumendi, G. & Kurjak, A. (2003). Three-dimensional and four-dimensional ultrasonography in the study of the fetal face. Ultrasound Review of Obstetrics and Gynecology, 3, 160-169.
3. British Medical Ultrasound Society. (2009). Guidelines for the safe use of diagnostic ultrasound equipment. Online at
http://www.bmus.org/policies-guides/BMUS-Safety-Guidelines-2009-revision-FINAL-Nov-2009.pdf
4. Cohn, J. F., & Ekman, P. (2005). Measuring facial action and automatic facial image analysis. In J. A. Harrigan, R. Rosenthal, & K. Scherer (Eds.), Handbook of nonverbal behavior research methods in the affective sciences (pp. 9–64). New York, NY: Oxford.
5. De Vries, J. I., & Hopkins, B. (2005). Fetal movements and postures: What do they mean for postnatal development? In B. Hopkins & S. P. Johnson (Eds.), Prenatal development of postnatal functions (pp. 177–219). Westport, CT: Praeger.