Nurcahyani, D., and D. Saputro. “Estimasi Parameter Model Vector Autoregressive With Exogenous Generalized Space Time Autoregressive (VARX-GSTAR)”. PRISMA, Prosiding Seminar Nasional Matematika, Vol. 4, Feb. 2021, pp. 621-7, https://journal.unnes.ac.id/sju/prisma/article/view/45037.