V. Pacheco, P. Molina, L.A. Jimenez, E. Oyarbide: “Improving the Energy Efficiency of Lifts”, 5th Symposium on Lift and Escalator Technologies 2015, Northampton, UK, 2015

Access here  https://liftescalatorlibrary.org/paper_indexing/abstract_pages/00000086.html

There is also access to video presentation of this paper here

https://www.youtube.com/watch?v=5rqOmlTKrvU&list=PLa5-w0efaxTG3W-A00Z7DD7ZfzsGtJAgw&index=3