http://gigazine.net/news/20110405_furueru/

http://pliocene.seesaa.net/article/106924971.html

http://gigazine.net/news/20110411_secondhand_smoke_affect_kids_mental_health/

http://news.goo.ne.jp/article/diamond/business/2011041101-diamond.html?fr=rk

http://www.nikkansports.com/general/news/f-gn-tp0-20110412-759957.html

http://www.yuhikaku.co.jp/books/detail/9784641115033

http://www.courts.go.jp/aomori/about/osirase/11_04_11_dial_aomori.html

http://www.moj.go.jp/content/000072829.pdf

http://headlines.yahoo.co.jp/hl?a=20110411-00000045-mai-soci

http://headlines.yahoo.co.jp/hl?a=20110411-00000167-jij-pol