Optional referendum

1 If within 100 days of the official publication of the enactment any 50,000 persons eligible to vote or any eight Cantons request it, the following shall be submitted to a vote of the People:

a. federal acts;
b. emergency federal acts whose term of validity exceeds one year;
c. federal decrees, provided the Constitution or an act so requires;
d. international treaties that:
      1. are of unlimited duration and may not be terminated;
      2. provide for accession to an international organisation;
      3.90 contain important legislative provisions or whose implementation requires the enactment of federal legislation.