Maniruzzaman, M., T. Chowdhury, M. A. Rahman, and M. A. H. Chowdhury. “Potassium Requirement for Leaf Biomass Yield and K Nutrition of Stevia”. Fundamental and Applied Agriculture, vol. 2, no. 3, Sept. 2017, pp. 297-02, doi:10.5455/faa.276431.