How many signatures are required to start the formal decision making stage of a direct democracy mechanism?

Source:

Constitutionof the Republic of Liberia

(Adoptedin January 1986)

http://www.liberianlegal.com/constitution1986.htm#_THE_LEGISLATURE

Article 91.

This Constitution may be amended whenever a proposalby either (1) two-thirds of the membership of both Houses of the Legislature or(2) a petition submitted to the Legislature, by not fewer than 10,000 citizenswhich receives the concurrence of two-thirds of the membership of both Housesof the Legislature, is ratified by two-thirds of the registered voters, votingin a referendum conducted by the Elections Commission not sooner than one yearafter the action of the Legislature.