“Mineral Nutrition of Cacao (Theobroma Cacao L.) II-Effects of Swollen Shoot Virus on the Growth and Nutrient Content of Plants Grown under Nutrient Deficient, Excess and Control Conditions in Sand Culture”. Tropical Agriculture, vol. 42, no. 1, Jan. 1965, https://journals.sta.uwi.edu/ojs/index.php/ta/article/view/3779.