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Katy Perry Katy Hudson (album) Katyusha (vũ khí) Katyusha (bài hát) Katy Perry: Part of Me Katya xấu xí Katyń (phim) Katya-Katyusha Katy, Texas KatynTài liệu tham khảo
WikiPedia: Katy_Perry_Live:_Witness_World_Wide http://www.news.com.au/entertainment/music/music-v... http://www.billboard.com/articles/columns/pop/7825... http://www.billboard.com/articles/columns/pop/7825... http://www.billboard.com/articles/columns/pop/7833... http://www.newyorker.com/culture/culture-desk/live...