“DECREASING THE BLACK-SCHOLES FORMULA FOR EUROPEAN PUT OPTION PRICING: PENURUNAN RUMUS BLACK-SCHOLES UNTUK PENENTUAN HARGA OPSI PUT EROPA”, JISTECH, vol. 6, no. 2, Jan. 2023, Accessed: Jul. 03, 2026. [Online]. Available: https://www.jistechunipa.com/index.php/istech/article/view/138