@MISC {AMAZA:2007a, title = {Production efficiency of soybean farmers in the Guinea savannas of West Africa: empirical evidence from Nigeria: poster paper presented at the International Farm Manegement Association Congress held at University College Cork, Ireland, 15-20 July 2007}, author = {Amaza, P. and Ogundari, K. }, year = {2007}, howpublished = {Poster}, note = {Available on CDROM}, }