1. Adjei-Nsiah S, Kuyper TW, Leewis C, Abeko MK, Cobbinah J, Sakyi-Dawson O, Giller KE (2007) Farmers’ agronomic and social evaluation of productivity, yield and N2-fixation in different cowpea varieties and their subsequent residual N effects on a succeeding maize crop. Nutr Cycl Agroecosyst 3:199–209. doi: 10.1007/s10705-007-9133-3
2. Coyne, CJ, Taylor, LD, Varshney RK (2009) Allelic diversity of USDA chickpea core collection of quantitative trait loci for resistance to ascochyta blight. (Abstract) Second International Ascochyta Workshop, June 29–July 2, 2009, Pullman, WA, USA
3. Delić D, Stajković O, Rasulić N, Kuzmanović D, Josić D, Miličić B (2010) Nodulation and N2 fixation effectiveness of Bradyrhizobium strains in symbiosis with Adzuki Bean, Vigna angularis. Braz Arch Biol Technol 53:293–299
4. FAOSTAT (2009) Food and Agriculture Organization of the United Nations. http://faostat.fao.org
5. Fried M, Middleboe V (1977) Measurement of amount of nitrogen fixed by legume crop. Plant Soil 47:713–715