(1)
Ukom, A.; Ojimelukwe, P.; Okpara, D. Nutrient Composition of Selected Sweet Potato [Ipomea Batatas (L) Lam] Varieties As Influenced by Different Levels of Nitrogen Fertilizer Application. Pak. J. Nutr. 2009, 8 (11), 1791–1795. https://doi.org/10.3923/pjn.2009.1791.1795.