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https://pdfs.semanticscholar.org/f0f9/e246c328283cc4c3a2d850e06928b4696cd4.pdf%20,%20https://www.researchgate.net/publication/336956233_Field_Performance_of_Xanthosoma_sagittifolium_L_Schott_Minitubers_Grown_Under_the_Influence_of_Poultry_Manure_and_NPK_Fertilizers_Changes_in_Content_of_Some_Secondary_Metabolites