Simeonova, I. 2025. CHALLENGES AND MEASURES FOR ADMINISTRATIVE SECURITY AT THE LOCAL LEVEL DURING THE INTRODUCTION OF THE EUROPEAN CURRENCY UNIT (EURO) IN BULGARIA: CHALLENGES AND MEASURES FOR ADMINISTRATIVE SECURITY AT THE LOCAL LEVEL DURING THE INTRODUCTION OF THE EUROPEAN CURRENCY UNIT (EURO) IN BULGARIA. JOURNAL SCIENTIFIC AND APPLIED RESEARCH. 29, 1 (Nov. 2025), 117–128. DOI:https://doi.org/10.46687/jsar.v29i1.461.