THAIBIL ANWAR; EKA NURMALA; WAHYUDI; SANUSI; SULTAN; MUHAMMAD DAVID. COST EFFECTIVE APPROACH: OPTIMAL CONTROL APPLICATION IN NARCOTICS ABUSE MODEL BY INVOLVING THE NUMBER OF DEATHS. International Journal of Economic, Business, Accounting, Agriculture Management and Sharia Administration (IJEBAS), [S. l.], v. 6, n. 3, p. 1519–1531, 2026. Disponível em: https://radjapublika.com/index.php/IJEBAS/article/view/5908. Acesso em: 19 jul. 2026.