Schiemenz, I.; Stiebler, M. (2001). "Control of a permanent magnet synchronous generator used in a variable speed wind energy system". IEMDC 2001. IEEE International Electric Machines and Drives Conference (Cat. No.01EX485). p. 872. doi:10.1109/IEMDC.2001.939422. ISBN0-7803-7091-0. S2CID110847930.
Schiemenz, I.; Stiebler, M. (2001). "Control of a permanent magnet synchronous generator used in a variable speed wind energy system". IEMDC 2001. IEEE International Electric Machines and Drives Conference (Cat. No.01EX485). p. 872. doi:10.1109/IEMDC.2001.939422. ISBN0-7803-7091-0. S2CID110847930.
One or more of the preceding sentences incorporates text from a publication now in the public domain: Hawkins, Charles Caesar (1911). "Dynamo". In Chisholm, Hugh (ed.). Encyclopædia Britannica (11th ed.). Cambridge University Press.