Saxena, N P and Erskine, W and Kumar, J and Johansen, C  (2000) Regional opportunities for cool season food legumes for sustainable and enhanced food production, and crop diversification in the Indo-Gangetic Plain.   In:  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, pp. 200-218.  ISBN 92-9066-418-5