The Impact of Aid on Bureaucratic Quality: Does the Mode of Delivery Matter? Journal of International Development, forthcoming (with P. Selaya).

Aid and Sectoral Growth. Evidence from Panel Data. Journal of Development Studies 46(2010): 1749-1766 (with P. Selaya).  

Less Aid Proliferation and More Donor Coordination: The Wide Gap between Words and Deeds. Journal of International Development 22 (2010): 920-940 (with I. Aldasoro, P. Nunnenkamp).

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.