NAIK, I A, and A J GUPTA. “Effect of Plant Density and Integrated Nutrient Management on Growth, Yield, Quality and Economics of Kale (Brassica Oleracea Var. Acephala) in Temperate Region*”. The Indian Journal of Agricultural Sciences, vol. 80, no. 1, Jan. 2011, https://epubs.icar.org.in/index.php/IJAgS/article/view/2826.