http://www.ohgizmo.com/2014/12/11/geeky-christmas-sweaters-perfect-season/

http://sivamuramai.tumblr.com/post/104921396422

http://www.charapedia.jp/research/0045/

https://twitter.com/fukazume_taro/status/542512164347453440

https://twitter.com/tarareba722/status/541601786260234240

https://twitter.com/gurumemakihara/status/543016587863674881

https://twitter.com/Yam_eye/status/541748249837596672 よく見かける。

https://twitter.com/04440/status/541613072301842434

http://konishiroku.tumblr.com/post/104920402984

https://twitter.com/kenkura/status/543309069885247489

http://www.inside-games.jp/article/2014/12/11/83346.html

http://www.itmedia.co.jp/mobile/articles/1412/11/news146.html

http://animatorexpo.com

http://animeanime.jp/article/2014/12/05/21111.html

https://twitter.com/maikana/status/542428898311434240