1. Cabinet Office, Government of Japan: Annual Report on the Aging Society,
http://www8.cao.go.jp/kourei/english/annualreport/index-wh.html
2. NAVITIME JAPAN: NAVITIME (in Japanese),
http://www.navitime.co.jp/
3. Motomura, Y.: BAYONET: Bayesian Network on Neural Network, Foundations of Real-World Intelligence, pp. 28–37. CSLI publications, Stanford (2001)
4. Pearl, J.: Fusion, propagation, and structuring in belief networks. Artificial Intelligence, 241–288 (1986)
5. Ubiquitous ID Center: Ubiquitous Communicator,
http://www.uidcenter.org/index-en.html