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Zaheer, K.B., Abd Aziz, M.I.B., Kashif, A.N. and Raza, S.M.M. 2018. Two Stage Portfolio Selection and Optimization Model with the Hybrid Particle Swarm Optimization. MATEMATIKA: Malaysian Journal of Industrial and Applied Mathematics. 34, 1 (May 2018), 125–141. DOI:https://doi.org/10.11113/matematika.v34.n1.1001.