1. NOVA School of Science and Technology, UNINOVA - CTS and LASI, NOVA University Lisbon,Caparica,Portugal,2829-516
2. Lipetsk State Technical University,Department of electric drive,Lipetsk,Russian Federation
3. Kazan State Power Engineering University,Department of Power Supply of Industrial Enterprises,Kazan,Russian Federation
4. University of Palermo,Department of Engineering,Palermo,Italy