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In page Amendments to the Constitution of Ireland:

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Once the referendum count has concluded the referendum returning officer signs a provisional referendum certificate, and publishes a copy in Iris Oifigiúil.[1] Anyone wishing to challenge the results of the referendum then has seven days to apply to the High Court for leave to present a referendum petition.[2] If no one makes such an application, if leave is not granted, or if a petition is dismissed the referendum certificate becomes final.