Denham, T., Haberle, S. G., Lentfer, C., Fullagar, R., Field, J., Porch, N., Therin, M., Winsborough B., and Golson, J. Multi-disciplinary Evidence for the Origins of Agriculture from 6950-6440 Cal BP at Kuk Swamp in the Highlands of New Guinea. Science, June 2003 issue.