Lu X. An Approximate Analytical Solution for Default-Free Zero-Coupon Bonds in a Two-Factor Vasicek Interest Rate Model with Stochastic Volatility. JSSH [Internet]. 2026 Jun. 30 [cited 2026 Jul. 12];8(6):47-50. Available from: https://bryanhousepub.com/index.php/jssh/article/view/3650