大山修一. 2019.西アフリカ・サヘル地域における農耕民と牧畜民の紛争の激化とその社会的背景．日本沙漠学会2019年第30回学術大会．東京農業大学世田谷キャンパス．東京都世田谷区

Oyama, S. 2019. From soil erosion to soil accumulation: recycling urban organic waste to the eroded land in Sahel, West Africa. Theme 2: Policy in action to address soil Erosion. Global Symposium on Soil Erosion. May 16. Food and Agriculture Organization of the United Nations Headquarters, Rome

大山修一. 2019. 「農耕文化圏と熱帯各地の農業―アフリカ．江原宏・樋口浩和 （編）．『熱帯農学概論』 123–131. 培風館. 本の紹介ページ

Oyama, S. 2019. Collapse of Self-Sufficiency, Rampant Poverty and the Era of Terrorism in Rural Niger. African Study Monographs supplementary 58: 115-132. [PDF]

Kirikoshi, H. 2019. Tree Shape Classification and Land Management by Hausa Farmers in Sahel Region of Southern Niger. African Study Monographs supplementary 58: 55-67. [PDF]

Aoike, U. 2019. Household Waste and Local Solid Waste Collection in Niamey, Republic of Niger. African Study Monographs supplementary 58: 93-114. [PDF]