“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), pp. 789–794. doi:10.54732/jeecs.v5i1.104.