(1)
van Averbeke, W.; Juma, K.; Tshikalange, T. Yield Response of African Leafy Vegetables to Nitrogen, Phosphorus and Potassium: The Case of <i>Brassica rapa</i> L. Subsp. <i>chinensis</i> and <i>Solanum retroflexum</I> Dun. WSA 2018, 33, 355-362.