@INBOOK {OKECHUKWU:2001, title = {Tuber and root information system (TRIS): an essential tool for research, planning and development}, author = {Okechukwu, R. and Quin, F. and Asiedu, R. }, year = {2001}, type = {Root crops in the 21st century: proceedings of the 7th Triennial Symposium of the International Society for Tropical Root Crops (ISTRC) - Africa Branch. Oct 1998. Government of Benin}, pages = {104--109}, }