1. Sociological Impact Monitoring/Sociological Assistance System;Brühl,1994
2. Vergleich von PVP Auslegungsprogrammen;Fahlenbock;internal GTZ-report,1994
3. Projektschluβbericht, PVP-Philippinen;Fahlenbock,1995
4. Technical maturity and reliability of photovoltaic pumping systems;Hahn,1995
5. A novel software tool for simulation and design of photovoltaic pumping systems;Mayer,1992