Muna, S., and K. Kuntoro. “APPLICATION OF THE HOLT-WINTERS EXPONENTIAL SMOOTHING METHOD ON THE AIR POLLUTION STANDARD INDEX IN SURABAYA”. Jurnal Biometrika Dan Kependudukan (Journal of Biometrics and Population), vol. 10, no. 1, June 2021, pp. 53-60, doi:10.20473/jbk.v10i1.2021.53-60.