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Ito, O and Johansen, C and Adu-Gyamfi, J J and Katayama, K and Kumar Rao, J V D K and Rego, T J, eds. (1996) Roots and nitrogen in cropping systems of the semi-arid tropics. Proceedings of the International Workshop: Dynamics of Roots and Nitrogen in Cropping Systems of the Semi-Arid Tropics, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh, India, 21-25 November 1994. JIRCAS International Agriculture Series (3). Japan International Research Center for Agricultural Sciences, Tsukuba, Ibaraki, Japan.. ISBN 4-906635-01-6
Adu-Gyamfi, J J (1999) Food Security in Nutrient-Stressed Environments: Exploiting Plants' Genetic Capabilities, Summary and Recommendations of an International Workshop 27-30 Sep 1999. Manual. International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Andhra Pradesh, India.
Subbarao, G V and Sahrawat, K L and Nakahara, K and Rao, I M and Ishitani, M and Hash, C T and Kishii, M and Bonnett, D G and Berry, W L and Lata, J C (2013) A paradigm shift towards low-nitrifying production systems: the role of biological nitrification inhibition (BNI). Annals of Botany, 112 (2). pp. 297-316. ISSN 0305-7364