1. Solar and wind home heating and domestic hot water systems: energy and economics study;Darkazalli,1976
2. Design and installation of heating system for Umass Solar Habitat I;Wells;UMass Tech. Rep. UM-WF-TR-76-10,1976
3. Wind and solar thermal combinations for space heating;McGowan,1975
4. Design and operational evaluation of a 25 kW wind turbine generator for residential heating applications;Cromack,1977