GALBIATTI, JOAO ANTONIO, et al. “Effect of Boron and Soil Moisture on Nutritional Status and Grain Yield of Sunflower (Helianthus Annuus)”. The Indian Journal of Agricultural Sciences, vol. 83, no. 3, Mar. 2013, https://epubs.icar.org.in/index.php/IJAgS/article/view/28361.