Nurkhasanah; Minangsari, D. N. I.; Yulianny, V. A. THE COMBINATION OF ROSELLA (HIBISCUS SABDARIFFA, L) AND STEVIA (STEVIA REBAUDIANA) EXTRACTS INCREASE THE ANTIOXIDANT ACTIVITY AND STABILITY. Int J Pharm Pharm Sci 2016, 8, 411-412.