فهرس المقالات CO-GARCH حرية الوصول المقاله صفحة الملخص نص كامل 1 - Portfolio optimization using gray wolf algorithm and modified Markowitz model based on CO-GARCH modeling Fahime Jahanian Ahmad Mohammadi seyyed ali paytakhti oskooe Aliasghar Mottaghi 10.22034/amfa.2022.1966381.1787