Unveiling the Dynamics of Irregular Migration and Border Mission Expenditures at the Serbian - Romanian Frontier: A Wavelet-Based Approach. Sci. Ann. Econ. Bus. [Internet]. 2026 Sep. 29 [cited 2026 Sep. 30];73(3):617-39. Available from: https://saeb.feaa.uaic.ro/index.php/saeb/article/view/4267