1. I. K. Iliev, N. Kaloyanov, P. Gramatikov, A. Terziev, I. Palov, S. Stefanov, K. Sirakov and V. Kamburova, Energy Efficiency and Energy Management Handbook (Publishing centre at Ruse University, Ruse, 2012).
2. D. Yogi Goswami and F. Kreith, Energy Efficiency and Renewable Energy Handbook II Ed. (CRC Press, Taylor & Francis Group, LLC, 2016).
3. Electric Systems for Transportation
4. Energy Efficiency in Electric Transportation Systems
5. Route Profile Dependent Tram Regenerative Braking Algorithm with Reduced Impact on the Supply Network