@article{10_4153_CMB_1986_071_0,
     author = {Frank, Rolfdieter},
     title = {A {Characterization} of {Projective} {Metric} {Spaces}},
     journal = {Canadian mathematical bulletin},
     pages = {450--455},
     year = {1986},
     volume = {29},
     number = {4},
     doi = {10.4153/CMB-1986-071-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1986-071-0/}
}