The existence of constitutional rules providing for a referendum clearly does not preclude implementing legislation. On the contrary, it is natural for the constitution to set out the principles and for the other rules to be specified in ordinary legislation. In some states, the constitutional rule is implemented by a legal instrument that ranks higher than the ordinary law (in Andorra this is a “qualified” law, in Spain, Georgia and Portugal an “organic” law or implementing Act). In Russia, whose constitution contains only a few rules on referendums, the subject is regulated by a constitutional law. The situation is in theory the same in the Czech Republic, although such a constitutional law has not been passed there except with regard to the country’s accession to the European Union, and it has accordingly not yet been possible to organise national referendums on other subjects. When the referendum is rarely used, a special law may have to be passed each time one is organised (as in Finland, which has held two referendums).