NiFe₂O₄/(S,N)-doped graphene oxide composite as efficient electrochemical sensor for determination of sibutramine in dietary supplements: Original scientific paper. J. Electrochem. Sci. Eng. [Internet]. 2026 Jun. 27 [cited 2026 Jul. 27];16. Available from: https://pub.iapchem.org/ojs/index.php/JESE/article/view/3318