Silaban, Vetric Styven, Haikal Rahman, and Dedy Husrizal Syah. 2025. “Expert Advisor Construction Using Fixed Fractional Money Management and Williams Percent-R Indicator In DAX-30 (DE30) Trading: Analysis on Zero Spread Account”. Economic: Journal Economic and Business 4 (4):607-15. https://doi.org/10.56495/ejeb.v4i4.1208.