The nutrient content of five traditional South African dark green leafy vegetables—A preliminary study

By H. Schönfeldt, B. Pretorius. 2011

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Nutrient content of eight African leafy vegetables and their potential contribution to dietary reference intakes (2014, methodology): “However, the mean iron content in some leaf species of the 310 present study was considerably lower (3.2- to 6.8-fold), whilst total β-carotene content was 311 higher (2.5- to 4.5-fold) than reported (Schönfeldt and Pretorius, 2011).”
Current knowledge on Amaranthus spp.: research avenues for improved nutritional value and yield in leafy amaranths in sub-Saharan Africa (2014, background): “In regions infested by borers, harvesting by uprooting is preferred (Schippers 2004).”