1. (1) Y. Hiruma : “In-train Wireless LAN on Tsukuba Express Line”, Railway & Electrical Engineering, Vol. 17, No. 4, pp. 32-36 (2006-4) (in Japanese)
2. (2) H. Sugiyama : “Introduction of In-train Wireless LAN Service on Tokaido Shinkansen”, Railway & Electrical Engineering, Vol. 17, No. 4, pp. 32-36, (2006-4) (in Japanese)
3. (3) East Japan Railway company : “Improvement of In-train service in new Narita Express [Series E259]”, JR-East Press release, http://www.jreast.co.jp/press/2009/20090903.pdf (2009-9) (in Japanese)