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WikiPedia: Bảo_An_(huyện) http://www.people.com.cn/GB/shizheng/8198/35413/36... http://english.sz.gov.cn/gi/200708/t20070822_22917... http://hkjo.lib.hku.hk/archive/files/1456f650fd545... http://hkjo.lib.hku.hk/archive/files/4ca8d98fce6c9... //doi.org/10.1080%2F095023800110046641 https://web.archive.org/web/20080416045925/http://... https://web.archive.org/web/20160207181857/http://...