Didit Budi Nugroho, et al. “Model Regresi Untuk Return Aset Dengan Volatilitas Mengikuti Model GARCH(1,1) Berdistribusi Epsilon-Skew Normal Dan Student-T”. Limits: Journal of Mathematics and Its Applications, vol. 17, no. 2, Dec. 2020, pp. 181-99, https://journal.its.ac.id/index.php/limits/article/view/5479.