@ARTICLE{Schulz_D._Improved_2009, author={Schulz, D.}, volume={vol. 57}, number={No 4}, journal={Bulletin of the Polish Academy of Sciences Technical Sciences}, pages={311-315}, howpublished={online}, year={2009}, title={Improved grid integration of wind energy systems}, URL={http://journals.pan.pl/Content/105853/PDF/02_paper.pdf}, doi={10.2478/v10175-010-0133-0}, }