Y. HARAHAP, H. IRAWAN, and KUSWARDANI, “DEVELOPMENT AND VALIDATION OF ANALYTICAL METHOD OF 3, 4-METHYLENEDIOXY-N-ETHYLAMPHETAMINE IN DRIED BLOOD SPOT USING GAS CHROMATOGRAPHY-MASS SPEC-TROMETRY”, Int J App Pharm, vol. 12, no. 4, pp. 94–99, Jul. 2020.