@ARTICLE {BIEMOND:2012, title = {Are investments in an informal seed system for cowpea a worthwhile endeavour?}, author = {Biemond, P. C. and Stomph, T. and Kamara, A. and Abdoulaye, T. and Hearne, S. and Struik, P. C. }, journal = {International Journal of Plant Production}, year = {2012}, month = {July}, volume = {6}, number = {3}, pages = {367--386}, issn = {1735-6814}, url = {http://journals.gau.ac.ir:8080/Jm/Programs/JurnalMgr/VolumArticle/EN_215_8.pdf}, }