Are referendum results binding?

Italy
Constitution of 1947with Amendments through 2012
https://www.constituteproject.org/constitution/Italy_2012.pdf
Art75
[…]
Thereferendum shall be considered to have been carried if the majority of thoseeligible has voted and a majority of valid votes has been achieved. Theprocedures for conducting a referendum shall be established by law.
Art138
[...]The law submitted to referendum shall not be promulgated if not approved by amajority of valid votes.