References

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Houssou, N., X. Diao and S. Kolavalli, 2014. Economics of tractor ownership under rainfed agriculture with applications in Ghana. International Food Policy Research Institute, Washington, DC., USA. https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2539582##.

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Lakitan, B., 2016. Inclusive and sustainable management of suboptimal lands for productive agriculture in Indonesia. Suboptimal Land J., 3: 181-192.
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Statistics Indonesia, 2002. Census of agriculture: Various issues. BPS-Statistics Indonesia, Indonesia.

Winoto, J.H., 2004. Process of agricultural mechanization technology in Indonesia. Agency for Agricultural Research and Development, Bogor, Indonesia.