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Classification of Pneumonia Risk Factor Characteristics in Toddlers Using Classification and Regression Trees (CART) Case Study Regional General Hospital Dr. Tengku Mansur Tanjungbalai. Quadratic: J. Inn. Tech. Math. & Math. Educ. 2021, 1 (2), 88-93. https://doi.org/10.14421/quadratic.2021.012-02.