GUO, R, and Z W ZHONG. “FORECASTING AIR PASSENGER VOLUME IN SINGAPORE: DETERMINING THE EXPLANATORY VARIABLES FOR ECONOMETRIC MODELS”. MATTER: International Journal of Science and Technology 3, no. 1 (January 30, 2017): 123–139. Accessed April 29, 2024. https://grdspublishing.org/index.php/matter/article/view/1839.