Quorum requirements for a referendum to be valid

Mauritania
Answer
Not specified by legislation
Source
Constitution 1991 (with amendments in 2006)http://?www.?wipo.?int/?wipolex/?en/?text.?jsp?file_?id=193704
Constitution 1991 (with amendments in 2006)http://?www.?wipo.?int/?wipolex/?en/?text.?jsp?file_?id=193704