@techreport{Shepherd-1981-4214,
  author = {Shepherd, K and Stephens, D and Grosveld, F},
  title = {Wind Turbine Acoustic Standards},
  institution = {Bionetics Corporation},
  year = {1981},
  month = {may},
  url = {https://ntrs.nasa.gov/search.jsp?R=19820015857},
  keywords = {Wind Energy, Land-Based Wind, Noise},
}