Subakir, S. B., Jauhari, T., Iriana, P., Siagian, M. and Setiadji, S. (2005) “The impact of β-hCG on placental angiogenesis in pre-eclampsia”, Medical Journal of Indonesia, 14(2), pp. 67–70. doi: 10.13181/mji.v14i2.175.