@BOOK {SMITH:1995, title = {Socioeconomic characterization of environments and technologies: IITA research guide, No. 50}, author = {Smith, J. }, series = {IITA research guide, No. 50}, year = {1995}, month = {February}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {37p.; IITA Technologies}, }