DECREASING THE BLACK-SCHOLES FORMULA FOR EUROPEAN PUT OPTION PRICING: PENURUNAN RUMUS BLACK-SCHOLES UNTUK PENENTUAN HARGA OPSI PUT EROPA. JISTECH [Internet]. 2023 Jan. 22 [cited 2026 Jun. 21];6(2). Available from: https://jistechunipa.com/index.php/istech/article/view/138