“DECREASING THE BLACK-SCHOLES FORMULA FOR EUROPEAN PUT OPTION PRICING: PENURUNAN RUMUS BLACK-SCHOLES UNTUK PENENTUAN HARGA OPSI PUT EROPA” (2023) JISTECH: Journal of Information Science and Technology, 6(2). Available at: https://www.jistechunipa.com/index.php/istech/article/view/138 (Accessed: 3 July 2026).