Hubungan antara masukan kalsium,ion kalsium serum dengan perubahan tekanan darah primigravida setelah usia kehamilan 24 minggu = Relationships between calcium intake, serum ionized calcium and elevated blood pressure in primigravida after 24 weeks of gestation - Lukman Halim, author (Fakultas Kedokteran Universitas Indonesia, 1996)