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Opera Opera Việt Nam Opera (trình duyệt web) Opera Nova Bydgoszcz Opera Software Operation Mincemeat (phim) Opera Mini Opera GX (trình duyệt web) Operação Prato Opera LeśnaTài liệu tham khảo
WikiPedia: Opera_Việt_Nam https://www.vnam.edu.vn/NewsDetail.aspx?lang=&Item... https://web.archive.org/web/20221003105919/https:/... https://www.worldcat.org/oclc/682149444 https://www.worldcat.org/title/682149444 https://www.google.com.vn/books/edition/Viet_Nam/m... https://www.vnam.edu.vn/NewsDetail.aspx?lang=&Item... https://books.google.com.vn/books/about/Acting.htm... https://www.vnam.edu.vn/rs/Document/2015-LeThiMinh... https://cand.com.vn/dien-dan-van-nghe-cong-an/oper... https://web.archive.org/web/20230103052724/https:/...