Lu, Xiaolin. “An Approximate Analytical Solution for Default-Free Zero-Coupon Bonds in a Two-Factor Vasicek Interest Rate Model With Stochastic Volatility”. Journal of Social Science and Humanities 8, no. 6 (June 30, 2026): 47–50. Accessed July 12, 2026. https://bryanhousepub.com/index.php/jssh/article/view/3650.