@phdthesis{oai:tsukuba.repo.nii.ac.jp:00020758,
 author = {Abul, Bashar Md Rahmatullah},
 month = {},
 note = {2005, Includes bibliographical references},
 school = {筑波大学, University of Tsukuba},
 title = {Three essays on agricultural productivity, convergence, and causality},
 year = {2006}
}