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Osu, B. , Akpanibah, E. , Olunkwa, C.. "Mean-Variance Optimization of Portfolios with Return of Premium Clauses in a DC Pension Plan with Multiple Contributors under Constant Elasticity of Variance Model". World Academy of Science, Engineering and Technology, Open Science Index 137, International Journal of Mathematical and Computational Sciences (2018), 12(5), 89 - 94.