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K. Jarmkom and  P. Eakwaropas and  W. Khobjai and  S. Techaeoi,  Stability of Essential Oils in Pang-Rum by Gas Chromatography-Mass Spectrometry.   journal   = {International Journal of Medical, Health, Biomedical, Bioengineering and Pharmaceutical Engineering}, [online]. World Academy of Science, Engineering and Technology. May 2017, vol. 125(5). 290 - 293[viewed 18 August 2018]. Available from: http://waset.org/publications/10007202.