Hybrid Approach Redefinition (HAR) model for optimizing hybrid ensembles in handling class imbalance: a review and research frameworkHartono Hartono, Opim Salim Sitompul, Tulus Tulus, Erna Budhiarti Nababan and Darmawan NapitupuluMATEC Web Conf., 197 (2018) 03003DOI: https://doi.org/10.1051/matecconf/201819703003