U. Pangnakorn and  P. Tayamanont and  R. Kurubunjerdjit,  Sweetpotato Organic Cultivation with Wood Vinegar, Entomopathogenic Nematode and Fermented Organic Substance from Plants.   journal   = {International Journal of Nutrition and Food Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2013, vol. 81(9). 854 - 858
    [viewed 02 December 2021]. Available from: https://publications.waset.org/pdf/16616.