Less Aid Proliferation and More Donor Coordination: The Wide Gap between Words and Deeds. Journal of International Development, forthcoming (with I. Aldasoro, P. Nunnenkamp).

Aid and Sectoral Growth. Evidence from Panel Data. Journal of Development Studies, forthcoming (with P. Selaya).  

Sind Nichtregierungsorganisationen die besseren Entwicklungshelfer. Perspektiven der Entwicklungspolitik 10 (2009): 266-289 (with P. Nunnenkamp).

Keeping a Low Profile: What Determines the Allocation of Aid by Non-Governmental Organizations. World Development 37 (2009): 902-918 (with D.J. Koch, A. Dreher, P. Nunnenkamp)

Resource Booms, Inequality, and Poverty: The Case of Gas in Bolivia. Review of Income and Wealth 54 (2008): 407-437 (with J. Lay, M. Wiebelt).

Does US Aid Buy UN Voting Behaviour? A Disaggregated Analysis. Public Choice 136(2008): 139-164 (with A. Dreher, P. Nunnenkamp).

Does Aid for Education Educate Children: Evidence from Panel Data. World Bank Economic Review 22 (2008): 291-314 (with A. Dreher, P. Nunnenkamp).

External Shocks, Policy Reforms, and Pro-Poor Growth in Bolivia: A Simulation Analysis. Review of Development Economics 12 (2008): 37-56 (with J. Lay, M. Wiebelt).

Do Donors Target Aid in Line with the Millennium Development Goals? A Sectoral Perspective on Aid Allocation. Review of World Economics 143(4): 596-630 (with A. Dreher, P. Nunnenkamp).

The Impact of Coffee Price Changes on Rural Households in Uganda. Agricultural Economics 37(2007): 293-303 (with M. Bussolo, O. Godart, J. Lay)

Targeting Aid to the Needy and Deserving: Nothing But Promises? The World Economy 29 (2006): 1171-1201 (with P. Nunnenkamp).

Assessing the Allocation of Aid: Developmental Concerns and the Self-Interest of Donors. Indian Economic Journal 54 (2006): 26-51 (with G. Canavire, P. Nunnenkamp, L. Triveño).

Price Incentives, Non-Price Factors, and Agricultural Production in Sub-Saharan Africa: A Cointegration Analysis. African Development Review 15 (2003): 424–437.

The Bias Against Agriculture in Sub-Saharan Africa: Has it Survived 20 Years of Structural Adjustment Programs? Quarterly Journal of International Agriculture 42 (2003): 5–20.

The Social Impact of Structural Adjustment in Bolivia. Journal of International Development 15 (2003): 299–319.

A Social Accounting Matrix for Bolivia Featuring Formal and Informal Activities. Latin American Journal of Economics 40 (2003):1–34.

Können Öko-Label zu einer nachhaltigen Bewirtschaftung der tropischen Regenwälder beitragen? Zeitschrift für angewandte Umweltforschung 12 (1999): 261–266.

A CGE Model for Environmental Policy Evaluation in the South African Mining Sector. South African Journal of Economics 67 (1999): 456–474.

Social and Private Health and Old Age Insurance? Some Theoretical Considerations and the Chilean Experience. Applied Economics Quarterly  44 (1998): 367–392.

Conserving Tropical Rain Forests in Indonesia. Journal of Agricultural Economics 46 (1995): 187–199.

Policies to Reduce Tropical Deforestation and Degradation: A Computable General Equilibrium Analysis. Quarterly Journal of International Agriculture 33 (1994): 162-178.

Empirische Allgemeine Gleichgewichtsmodelle – Struktur und Anwendungsmöglichkeiten. Jahrbücher für Nationalökonomie und Statistik 213 (1994): 513–544 (with G. Klepper, O. Lorz, F. Stähler, M. Wiebelt).

National and International Policies for Tropical Rain Forest Conservation – A Quantitative Analysis for Cameroon. Environmental and Resource Economics 3 (1993): 501–531 (with M. Wiebelt).

The Profile of Protection in the Rice Sector. Quarterly Journal of International Agriculture 30 (1991): 349–365.