@BOOK {CLAASSEN:1996, title = {Mechanized minimum and no-till crop production for research farms: IITA research guide, No. 11}, author = {Claassen, S. L. }, series = {IITA research guide, No. 11}, year = {1996}, month = {March}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {19p.}, }