Issues of sub-national referendums regulated at the national level

Republic of The Congo (Brazzaville)
Answer
No data
Source
Constitution (2002)http://democratie.francophonie.org/article.php3?id_article=398&id_rubrique=124
Electoral Code (24/11/2001)http://www.cesbc.org/congo/Lois/Loi%2024-2001.pdf