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WikiPedia: Keep (ứng dụng) http://www.globaltimes.cn/content/1044819.shtml http://www.china.org.cn/sports/2017-12/18/content_... http://www.xinhuanet.com/english/2019-05/03/c_1380... http://www.xinhuanet.com/english/2019-05/11/c_1380... //dx.doi.org/10.3390%2Fsu10082702 https://tech.sina.com.cn/i/2019-11-04/doc-iicezuev... https://finance.sina.cn/2019-10-08/detail-iicezzrr... https://www.36kr.com/p/681607005337089 https://alltechasia.com/14008-2/ https://www.bloomberg.com/news/articles/2016-06-07...