ROBIYANTO, Robiyanto.
 Penggunaan Metode Orthogonal GARCH untuk Meramalkan Matriks Kovarians Return Indeks Harga Saham Sektoral Di Bursa Efek Indonesia.
<strong>Jurnal Ekonomi Kuantitatif Terapan</strong>, [S.l.], p. 167-174, june 2019.
ISSN 2303-0186.
Available at: &lt;<a href="http://ojs.unud.ac.id/index.php/jekt/article/view/33549" target="_new">http://ojs.unud.ac.id/index.php/jekt/article/view/33549</a>&gt;. Date accessed: 29 sep. 2025.
doi: <a href="https://doi.org/10.24843/JEKT.2019.v12.i02.p05">https://doi.org/10.24843/JEKT.2019.v12.i02.p05</a>.