Surono, Sugiyarto, Khang Wen Goh, Choo Wou Onn, and Ferna Marestiani. 2023. “Developing an Optimized Recurrent Neural Network Model for Air Quality Prediction Using K-Means Clustering and PCA Dimension Reduction”. International Journal of Innovative Research and Scientific Studies 6 (2):330-43. https://doi.org/10.53894/ijirss.v6i2.1427.