Suhartono, Suhartono, Muhammad Munawir Gazali, and Dedy Dwi Prastyo. 2018. “VARX and GSTARX Models for Forecasting Currency Inflow and Outflow With Multiple Calendar Variations Effect”. MATEMATIKA 34 (3):57-72. https://doi.org/10.11113/matematika.v34.n3.1139.