G. S. Riaz and F. Saeed, “A COMPARATIVE STUDY OF VAGINAL PROSTAGLANDIN E2 PESSARIES WITH INTRAVENOUS OXYTOCIN FOR THE INDUCTION OF LABOUR AFTER SPONTANEOUS RUPTURE OF MEMBRANES”, J Ayub Med Coll Abbottabad, vol. 4, no. 2, pp. 5–9, Jul. 1991.