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Calculated the diffuse and direct parts of global solar radiation in Baghdad city for the period (1983-2005) depending on clearness index by applying the two world models of Liu -Jordan. IJP [Internet]. 2019 Feb. 12 [cited 2024 May 3];12(25):94-104. Available from: https://ijp.uobaghdad.edu.iq/index.php/physics/article/view/309