@article{10_4153_CMB_1968_001_7,
     author = {Coxeter, H. S. M.},
     title = {The {Problem} of {Apollonius1}},
     journal = {Canadian mathematical bulletin},
     pages = {1--17},
     year = {1968},
     volume = {11},
     number = {1},
     doi = {10.4153/CMB-1968-001-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1968-001-7/}
}