1. Rosas, P.A., and Estanqueiro, A.J.: ‘Guidelines on grid connection for wind farms’, (Brazilian Wind Energy Center 2003),available at www.eolica.com.br
2. ‘Grid code regulations for high and extra high voltage’, E.ON. Netz Gmbh, Germany:, 1, April, 2006 p. 46, www.eon-netz.com
3. Eltra specifications for connecting wind farms to the transmission network. Eltra doc. no. 74174, Eltra, 2000, http://www.eltra.dk
4. Development of a model for predicting flicker from electric arc furnaces