URLs

• http://doujinshi.mugimugi.org/browse/author/449/Takei-Masaki/
• http://ja.wikipedia.org/wiki/竹井正樹
• https://www.animenewsnetwork.com/encyclopedia/people.php?id=16660
• http://erogamescape.ddo.jp/~ap2/ero/toukei_kaiseki/creater.php?creater=28