@BOOK {COUPER:1995e, title = {Techniques de defrichage dans les stations agricoles experimentales: Guide de recherche de l'Iita, No. 5}, author = {Couper, D. C. }, series = {Guide de recherche de l'Iita, No. 5}, year = {1995}, month = {March}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {17p.}, }