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[3] GASCH, R., TWELE, J. Wind Power Plants: Fundamentals, Design, Construction and Operation. 2nd ed. Heidelberg: Springer, 2012. ISBN 978-3-642-22937-4.
[4] MacKAY, D. J. C. Sustainable Energy - without the hot air. Cambridge: UIT, 2008. ISBN 978-0-9544529-3-3 .