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WikiPedia: Heiankyo Alien http://www.arcade-museum.com/game_detail.php?game_... http://www.klov.com/game_detail.php?letter=D&game_... http://www.g-mode.co.jp/en/news/press/main03.html http://www.hyperware.co.jp/software/heian/ http://plusd.itmedia.co.jp/games/articles/0704/20/... http://www.hardcoregaming101.net/heiankyo-alien/ https://translate.google.com/translate?sl=ja&tl=en... https://store.steampowered.com/app/690710/HEIANKYO... https://archive.org/details/ArcadeGameList1971-200... https://archive.org/details/old-school-gamer-011/p...