Analysis of information sources in references of the Wikipedia article "Goguryeo–Sui War" in English language version.
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: CS1 maint: archived copy as title (link).The King of Koguryo offered to submit and the Chinese army straggled home thinking they had won. The Korean king, however, failed to show up to swear allegiance. A furious Emperor Yang was dissuaded from a fourth invasion only with difficulty.
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: CS1 maint: archived copy as title (link).