^
Burton, Tony; David Sharpe; Nick Jenkins; Ervin Bossanyi (2001).
Wind Energy Handbook. John Wiley and Sons. p. 464.
ISBN0-471-48997-2. Retrieved 2009-03-16.
^
Burton, Tony; David Sharpe; Nick Jenkins; Ervin Bossanyi (2001).
Wind Energy Handbook. John Wiley and Sons. p. 464.
ISBN0-471-48997-2. Retrieved 2009-03-16.