SIMEONOVA, I. . 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, [S. l.], v. 29, n. 1, p. 117–128, 2025. DOI: 10.46687/jsar.v29i1.461. Disponível em: https://jsar.ftn.shu.bg/ojs-3.3.0-7/index.php/jsar/article/view/461. Acesso em: 6 dec. 2025.