URLs

• https://ja.wikipedia.org/wiki/中山勝一
• https://anidb.net/creator/1481
• https://www.animenewsnetwork.com/encyclopedia/people.php?id=3696
• https://www7.atwiki.jp/anime_wiki/pages/47.html
• https://www18.atwiki.jp/sakuga/pages/1465.html