@article{10_4153_S0008439519000377,
     author = {Healy, Brendan Burns},
     title = {Rigidity {Properties} for {Hyperbolic} {Generalizations}},
     journal = {Canadian mathematical bulletin},
     pages = {66--76},
     year = {2020},
     volume = {63},
     number = {1},
     doi = {10.4153/S0008439519000377},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439519000377/}
}