"The use of public resources by the authorities for campaigning purposes must be prohibited. Political parties and their representatives, including those who are elected representatives or hold a public office, are entitled to take actively part in the campaign. Particular duties of reserve may apply to the persons belonging to the public authority responsible for the organisation or supervision of the referendum."
CoE (Venice Commission): Revised Guidelines on the Holding of Referendums, para. I.3.1.b

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Revised Guidelines on the Holding of Referendums

Spanish; Castilian