@techreport{Spencer-1981-4217,
  author = {Spencer, R},
  title = {Noise Generation of Upwind Rotor Wind Turbine Generators},
  institution = {Boeing},
  year = {1981},
  month = {feb},
  url = {http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19820015808.pdf},
  keywords = {Wind Energy, Land-Based Wind, Noise},
}