Johansen, C and Duxbury, J M and Virmani, S M and Gowda, C L L and Pande, S and Joshi, P K, eds.  (2000) Legumes in rice and wheat cropping systems of the indo-gangetic plain - constraints and opportunities.    International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Andhra Pradesh, India.  ISBN 92-9066-418-5