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Serraj, R and Gyamfi, J A and Rupela, O P and Drevon, J J (2004) Improvement of legume productivity and role of symbiotic nitrogen fixation in cropping systems: Overcoming the physiological and agronomic limitations. In: Symbiotic Nitrogen Fixation Prospects for Enhanced Applicationin Tropical Agriculture. Oxford and IBH Publishing Co. Pvt. Ltd., New Delhi, pp. 67-97. ISBN 8120416147
Subbarao, G V and Rao, I M and Nakahara, K and Ando, Y and Sahrawat, K L and Tesfamariam, T and Lata, J C and Boudsocq, S and Miles, J S and Ishitani, M and Peters, M (2013) Nitrogen management in grasslands and forage-based production systems – Role of biological nitrification inhibition (BNI). Tropical Grasslands – Forrajes Tropicales, 1. pp. 149-155. ISSN 2346-3775