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Trần, Trọng Dương. (2009) "Investigation on 'Đại Cồ Việt' (Việt nation - Buddhist nation)" originally published in Hán Nôm, 2 (93) p. 53–75. online versionArhivirano 2021-08-02 na Wayback Machine. (in Vietnamese)
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Trần, Trọng Dương. (2009) "Investigation on 'Đại Cồ Việt' (Việt nation - Buddhist nation)" originally published in Hán Nôm, 2 (93) p. 53–75. online versionArhivirano 2021-08-02 na Wayback Machine. (in Vietnamese)