SB-Net: A Novel Spam Botnet Detection Scheme With Two-Stage Cascade Learner and Ensemble Feature Selection. - Irsyad Fikriansyah Ramadhan; Muhammad Aidiel Rachman Putra; Jean De La Croix Ntivuguruzwa; Tohari Ahmad; Kannole E. Veronica; Kambombo Mtonga; Enatha Rweyemamu; Royyana Muslim Ijtihadie (IEEE Open J. Commun. Soc., 2025)