1. Handbook Energy Conservation (2003). Edited by the Energy Conservation Center, Japan, 103 2003–12.
2. , Development and Running Test Results of a Contact-wire-less Tramcar using Lithium Ion Rechargeable Battery, IEEJ Research Paper on Transportation and Electric Railway, TER-04.51, 29–34 2004–9.
3. , , , , . Development of the NE Train (Diesel Hybrid System), Paper of IEEJ Industrial Application Conference 2006, 1-O5-3, I-113-118 2006–8.
4. , , . Trolley & on-board battery hybrid control to supress the regeneration cancellation and the running test results by a tram-class electric vehicle, IEEJ Research Paper on Transportation and Electric Railway, TER-05-40, 63–68 2005–7.