Quorum requirements for a referendum to be valid

Burundi
Answer
No quorum requirements
Source
Burundi'sConstitution of 2005
https://www.constituteproject.org/constitution/Burundi_2005.pdf
Loi No1/ 22 DU 18 SEPTEMBRE 2009 PORTANT REVISION DE LA Loi No1/015 DU20 AVRIL 2005 PORTANT CODE ELECTORAL.