Home Publications & Data Report Results and methodology of diagnostic trials on common beans (Phaseolus vulgaris) in Rwanda: a critical appraisal author(s) Graf, W published in1987 regions Rwanda original file download full citation GRAF, W.; Trutmann, P. 1987. Results and methodology of diagnostic trials on common beans (Phaseolus vulgaris) in Rwanda: a critical appraisal. Centro Internacional de Agricultura Tropical (CIAT), Cali, CO. 10 p.