@article{10_4153_S0008439520000466,
     author = {Freslon, Amaury},
     title = {Positive definite functions and cut-off for discrete groups},
     journal = {Canadian mathematical bulletin},
     pages = {306--322},
     year = {2021},
     volume = {64},
     number = {2},
     doi = {10.4153/S0008439520000466},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439520000466/}
}