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Tài liệu tham khảo WikiPedia: Gravity Falls (mùa 2) http://www.avclub.com/article/gravity-falls-ending... http://shmalexsmirsch.tumblr.com/post/133619326491... http://www.tvguide.com/tvshows/gravity-falls/31970... http://www.animationmagazine.net/tv/falls-inevitab... https://www.reddit.com/r/gravityfalls/comments/1kg... https://www.youtube.com/watch?v=OtVkMu1Ds7A
