Rikumahu B, Akhmad MF. Comparison of black-scholes models using historical volatility and garch volatility in collar strategy as hedging efforts for towr and tbig stocks. International Journal of Accounting and Management Information Systems [Internet]. 2025 Jun. 11 [cited 2025 Jul. 31];1(2):143-61. Available from: https://goodwoodpub.com/index.php/ijamis/article/view/3043