1. Office of electricity delivery and energy reliability, Smart grid, Internet: http://www.oe.energy.gov/smartgrid.htm, Accessed: August 2009.
2. Paul Marken, John Marczewski, Robert D’Aquila, Paul Hassink, Jim Roedel, VFT – A Smart Transmission Technology That Is Compatible With the Existing and Future Grid, IEEE Power Systems Conference and Exposition, 2009.
3. P. E. Marken, Variable frequency transformer – a simple and reliable interconnection technology, EPRI HVDC Conference, September 2007.
4. J. Gagnon, D. Galibois, D. McNabb, D. Nadeau, P. Paquette, E. Larsen, D. McLaren, D. Piwko, C. Wegner, H. Mongeau, A 100 MW variable frequency transformer (VFT) on the Hydro-Québec Network, CIGRE, France, 2006.
5. D. Nadeau, A 100-MW variable frequency transformer (VFT) on the Hydro- Québec TransÉnergie Network – the behavior during disturbance, IEEE PE General Meeting, Page(s): 26-28, 2007.