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The increase of financial investment induce the investors, financial analysts and specialists to look for Low-risk and High-return investment opportunities, represented as investment portfolios selected and built on scientific bases such portfolios represent the best way to minimize risks and maximize returns. They called as efficient and optimal portfolios. Many developments happened on the Markowitz theory; the researchers see that the portfolio investment needs to continuous developments.doi:10.21928/juhd.v0n0y2018.pp221-235 fatcat:gxz2exyuyffndo3dj6rcrwawkm