1. Ministry of Internal Affairs and Communications, “Aggregation and Preliminary Calculation of Internet Traffic in Japan” October 7, 2014 (in Japanese).
http://www.soumu.go.jp/main_content/000316564.pdf
2. Ministry of Internal Affairs and Communications, Information & Communications Statistic Database, Data by field/Communications/Traffic (in Japanese).
http://www.soumu.go.jp/johotsusintokei/field/tsuushin06.html
3. Ministry of Internal Affairs and Communications, Information & Communications Statistic Database, Data by field/Communications/Internet (in Japanese).
http://www.soumu.go.jp/johotsusintokei/field/tsuushin01.html
4. K. Cho, “Broadband Traffic Report,” Internet Infrastructure Review, Vol. 20, pp. 32–37, 2013.
5. “Hikari Collaboration Model,” NTT press release published on May 13, 2014.