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Assessing Nitrogen Flow in Production and Utilization Cycle of Wheat and Maize As a Tool to Monitor N Loss in Iran - Doi: 10.4025 actascibiolsci.V35i3.16039. Acta Sci. Biol. Sci. 2013, 35 (3), 327-334. https://doi.org/10.4025/actascibiolsci.v35i3.16039.