Quote

"Special rules providing for an exception to the normal vote-counting rules, in a proportional way, in the case of a referendum concerning the situation of national minorities do not, in principle, run counter to equal suffrage. "

Document

CoE (Venice Commission): Code of Good Practice on Referendums, para. 2.3

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Code of Good Practice on Referendums

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Summaries

Elections must be held by equal suffrage.
Some measures taken to ensure equitable representation of minority groups should not be considered discriminatory.