Residence:
i. a residence requirement may be imposed; residence in this case means habitual residence;
ii. a length of residence requirement may be imposed on citizens solely for local or regional referendums;
iii. the requisite period of residence should be reasonable and, as a rule, should not exceed six months;
iv. the right to vote in referendums should be granted to citizens residing abroad under conditions not more onerous than those applying to elections.