diplomatic conference, Convention for the Protection of Literary and Artistic Works… (1886)
“ For the purpose of establishing its contribution towards the budget, each country of the Union shall belong to a class, and shall pay its annual contributions on the basis of a number of units fixed as follows: (b) Unless it has already done so, each country shall indicate, concurrently with depositing its instrument of ratification or accession, the class to which it wishes to belong. Any country may change class. If it chooses a lower class, the country must announce it to the Assembly at one of its ordinary sessions. ”
