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Kajsongkram, T. , Rotamporn, S. , Limbunruang, S. , Thubthimthed, S.. "Development and Validation of a HPLC Method for 6-Gingerol and 6-Shogaol in Joint Pain Relief Gel Containing Ginger (Zingiber officinale)". World Academy of Science, Engineering and Technology, Open Science Index 108, International Journal of Medical and Health Sciences, (2015), 9(12), 813 - 817.