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“DECREASING THE BLACK-SCHOLES FORMULA FOR EUROPEAN PUT OPTION PRICING: PENURUNAN RUMUS BLACK-SCHOLES UNTUK PENENTUAN HARGA OPSI PUT EROPA”. JISTECH: Journal of Information Science and Technology 6, no. 2 (January 22, 2023). Accessed May 7, 2026. https://jistechunipa.com/index.php/istech/article/view/138.