N. Ramli, S. M. A. Mutalib, and D. Mohamad, “Fuzzy Time Series Forecasting Model based on Frequency Density and Similarity Measure Approach”, IJET, vol. 7, no. 4.30, pp. 281–284, Nov. 2018, doi: 10.14419/ijet.v7i4.30.22284.