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Idris, Ismaila, Ali Selamat, Thanh Nguyen Ngoc, Sigeru Omatu, Ondrej Krejcar, Kamil Kuca, and Marek Penhaker. A Combined Negative Selection Algorithm-particle Swarm Optimization for an Email Spam Detection System. Elsevier, 2015.

Idris, Ismaila, et al. A Combined Negative Selection Algorithm-particle Swarm Optimization for an Email Spam Detection System. Elsevier, 2015.