Quorum requirements for a referendum to be valid

Timor-Leste
Answer
Optional referendum - turnout quorum
Source
Constitutionof the Democratic Republic of Timor Leste
(adopted20 May 2002)
(Englishtranslation)
http://timor-leste.gov.tl/wp-content/uploads/2010/03/Constitution_RDTL_ENG.pdf
Article 66(4).
A referendum shallonly be binding where the number of voters is higher than half of theregistered electors.
Comment
50% of registered electors