Nainggolan R, Montebon CQ. Ownership Concentration and Asset Risk-Return Profiles : A Quantitative Study of Systematic and Idiosyncratic Risks. reaksi [Internet]. 2026 Apr. 30 [cited 2026 Jun. 26];11(1):1-18. Available from: https://journals2.ums.ac.id/reaksi/article/view/16722