https://www.netsecurity.ne.jp/1_13686.html

https://www.netsecurity.ne.jp/1_13683.html

http://thinkit.jp/article/992/1/

http://www.is.noda.tus.ac.jp/ppl_ss09/

http://japan.zdnet.com/news/sec/story/0,2000056194,20397071,00.htm

http://internet.watch.impress.co.jp/docs/news/20090723_304179.html

http://codezine.jp/article/detail/4065

https://www.jpcert.or.jp/wr/2009/wr092801.html

Co-located with 17th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems (ACM GIS 2009) November 3, 2009, Seattle, WA, USA http://www.cs.purdue.edu/homes/daic/springl09