Muninggar, L., Yusuf, M. and Prasetyo, B. (2019) “Maternal mortality risk factor in pregnancy with heart disease at Dr. Soetomo General Hospital, Surabaya, Indonesia”, Majalah Obstetri & Ginekologi, 27(1), pp. 17–23. doi: 10.20473/mog.V27I12019.17-23.