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Từ Quang T. and Lê Phương , D. 2021. Study on biological characteristics, production capacity and economic efficiency of the eastern spot-billed duck (anas poecilorhyncha zonorhyncha) raised in households in Ninh Binh Province. SCIENTIFIC JOURNAL OF TAN TRAO UNIVERSITY. 6, 17 (Apr. 2021), 6–12. DOI:https://doi.org/10.51453/2354-1431/2020/372.