FİNANSAL ZAMAN SERİLERİNDE YAPISAL KIRILMALARIN FOURİER YAKLAŞIMI İLE ANALİZİ: BIST BANKA ENDEKSİ UYGULAMASI (ANALYSIS OF STRUCTURAL BREAKS IN FINANCIAL TIME SERIES USING THE FOURIER APPROACH: APPLICATION TO THE BIST BANKING INDEX) - Mustafa Akif ASLAN -Bülent İLHAN | The Journal of Social Sciences