“Forecasting Sales of Premium Oil Fuel, Pertalite, Pertamax, Pertamax Turbo and Bio Solar Using the Method Exponential Moving Average (EMA) (case Study: Klampis Gas Station Surabaya)”. 2020. JEECS (Journal of Electrical Engineering and Computer Sciences) 5 (1): 789-94. https://doi.org/10.54732/jeecs.v5i1.104.