Fariza, Arna, et al. “Spatial Mapping of Toddler Pneumonia Vulnerability in Bojonegoro, Indonesia, Using Hybrid Genetic Algorithm – K-Means (GA-Kmeans)”. International Journal of Engineering & Technology, vol. 7, no. 4.40, Dec. 2018, pp. 162-7, https://doi.org/10.14419/ijet.v7i4.40.24425.