TY - JOUR A1 - Delcheva, E. A1 - Balabanova, D. A1 - McKee, M. T1 - Under-the-counter payments for health care: Evidence from Bulgaria Y1 - 1997 DO - 10.1016/S0168-8510(97)00061-4 JF - Health Policy VL - 42 IS - 2 SP - 89 EP - -100 ER -