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Ghobadi, Z. , Esfahani, Z. , Azizi, M.. "Determination of Effective Variables on Arachidonic Acid Production by Mortierella alpina CBS 754.68in Solid-State Fermentation using Plackett-Burman Screening Design". World Academy of Science, Engineering and Technology, Open Science Index 57, International Journal of Chemical and Molecular Engineering, (2011), 5(9), 814 - 816.