1. Description of Photovoltaic Pumping Systems for N.T.T.;AEG Telefunken,1981
2. A photovoltaic-powered system for medium head pumping;Pulfrey,1985
3. An optimum design of photovoltaic direct coupled water pumping system;Hori,1985
4. PV water pumping with reciprocating volumetric (jack) pumps;Martlin,1981