Ekasasmita, Wahyuni, Khaera Tunnisa, and Muh. Tri Aditya. “The Application of Discrete Hilbert Transform in Measuring Asset Return Risk in Investment Portfolios”. Jurnal Akuntansi, Keuangan, dan Manajemen 6, no. 2 (March 11, 2025): 399–408. Accessed May 19, 2025. https://penerbitgoodwood.com/index.php/Jakman/article/view/3803.