Mathew, J., V. Krishnakumar, and C. N. Namboothiri. “Potential of Native Weed Species As Nutrient Contributors of Coconut Garden in an Entisol”. Journal of Plantation Crops, vol. 42, no. 2, Apr. 2014, pp. 231-7, https://updatepublishing.com/journal/index.php/JPC/article/view/5606.