David D, Naimah Z. Securities Market Efficiency During The Announcement Period Of The President And Vice President For The 2024-2025 Period: Abnormal Changes In Return And Trading Volume Activity. EKOMBIS [Internet]. 13Jul.2026 [cited 23Jul.2026];14(3):3289-300. Available from: https://jurnal.unived.ac.id/index.php/er/article/view/10070