http://www.afpbb.com/article/environment-science-it/it/2878673/8930002?ctm_campaign=txt_topics

http://www.nikkei-science.com/page/sci_book/bessatu/51184.html

http://www.tokyo-np.co.jp/s/article/2012051990070601.html

http://news.goo.ne.jp/article/hrn/bizskills/hrn_756b0b36cab2404706e899638c7b9a03.html?fr=rk

http://news.goo.ne.jp/article/diamond/business/2012051807-diamond.html?fr=rk

http://headlines.yahoo.co.jp/hl?a=20120518-00000104-san-soci

http://headlines.yahoo.co.jp/hl?a=20120517-00000716-yom-soci

http://www.tokyo-np.co.jp/s/article/2012051801002145.html