1. Electric Motors for Light Traction
2. Lead-acid and lithium-ion batteries for the Chinese electric bike market and implications on future technology advancement
3. https://www.electricbike.com/e-bike-patents-from-the-1800s.
4. H. Neupert, AABC Meeting 2016, Mainz, 27th January 2016, Industrial and Specialty Automotive Section.
5. H. Neupert, Batteries for Light Electric Vehicles (LEV's), Lithium Battery Seminar, Karlstein (Germany), November 15, 2005. http://extraenergy.org/files/HannesNeupert-EE.pdf.