Keliwar, S. et al. 2018. Modeling of time series data for forecasting the number of foreign tourists in east Kalimantan using fuzzy inference system based on ARX model. International Journal of Engineering & Technology. 7, 2.2 (Mar. 2018), 104–107. DOI:https://doi.org/10.14419/ijet.v7i2.2.12745.