Moreover, a particularly high quorum is sometimes required for fundamental decisions. In Latvia, when a constitutional amendment is submitted to referendum, it must be approved by more than 50% of the registered voters. In Lithuania, certain particularly important rules relating to sovereignty can only be decided by a majority of three-quarters of the electorate, while others relating to the state and constitutional revisions require a majority of the electorate. In Croatia, a “yes” vote of a majority of the electorate is required in the case of an association with other states.