1. Height variations of wind speed and wind distribution statistics;Justus;Geophys. Res. Lett.,1976
2. Benefit-cost methodology study with example application of the use of wind generators;Zimmer;Ref. NASA CR-134864,1975
3. General Electric,1975
4. Design characteristics and cost of advanced technology wind turbine generator for Minnesota wind spectra;Wiesner;Boeing Vertol Rep. D210-11051-2,1976