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