1. Measurement and assessment of power quality characteristics of grid connected wind turbines. IEC 61400-21, 2001.
2. Model for power spectra of the blade of a wind turbine measured from the moving frame of reference
3. The spectra of wind speed fluctuations met by a rotating blade and resulting load fluctuations. Proceedings of EWEC '84, 1984; 453-458.
4. Guidelines for grid connection of wind turbines. Revised edition. SINTEF Energy Research TR A5329, 2001; (in Norwegian).
5. Connection of small production units to the electric network. AMP, 1999; (in Swedish).