Pipai, Rachel, McNeill, Ann, Unkovich, Murray, Banabas, Murom, and Nelson, Paul N. (2023) Biological nitrogen fixation by legume cover plants in oil palm plantations: calibration of the ureide technique and effects of plantation age and soil nitrate. Plant and Soil, 491. pp. 665-680.

Pipai, Rachel, Unkovitch, Murray, McNeill, Ann, Banabas, Murom, Webb, Michael, Herridge, David, and Nelson, Paul (2011) Nitrogen fixation by legumes under oil palm plantations in Papua New Guinea. In: International Congress on Nitrogen Fixation. From: 17th International Congress on Nitrogen Fixation, 27 November -1 December 2011, Perth, Australia. (Unpublished)

Nelson, Paul N., Webb, Michael J., Orrell, Ian, van Rees, Harm, Banabas, Murom, Berthelsen, Suzanne, Sheaves, Marcus, Bakani, Felix, Pukam, Otto, Hoare, Michael, Griffiths, William, King, Graham, Carberry, Peter, Pipai, Rachel, McNeill, Ann, Meekers, Petra, Lord, Simon, Butler, James, Pattison, Tony, Armour, John, and Dewhurst, Charles (2010) Environmental sustainability of oil palm cultivation in Papua New Guinea. ACIAR Technical Reports, 75 . Australian Centre for International Agricultural Research, Canberra, ACT, Australia.

Nelson, P.N., Banabas, M., Webb, M.J., Sheaves, M., Huth, N., McNeill, A., Koczberski, G., Berthelsen, S., and Orrell, I. (2010) Environmental sustainability indicators for oil palm in Papua New Guinea – conceptual framework for a research and development project. In: Agri-environmental Indicators Workshop, associated with the 2nd International Conference on Oil Palm and the Environment (ICOPE). From: Agri-environmental Indicators Workshop, associated with the 2nd International Conference on Oil Palm and the Environment (ICOPE), 23-27 February 2010, Bali, Indonesia. (Unpublished)