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WikiPedia: Ayakum http://www.wlmqwb.com/2971/baz/200907/t20090728_77... http://earthobservatory.nasa.gov/IOTD/view.php?id=... //tools.wmflabs.org/geohack/geohack.php?language=v... http://vietnamnet.vn/vn/khoa-hoc/20725/can-canh-no... https://web.archive.org/web/20121127140421/http://...