@article{10_4153_CMB_1997_019_0,
     author = {Coxeter, H. S. M.},
     title = {The {Trigonometry} of {Hyperbolic} {Tessellations}},
     journal = {Canadian mathematical bulletin},
     pages = {158--168},
     year = {1997},
     volume = {40},
     number = {2},
     doi = {10.4153/CMB-1997-019-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1997-019-0/}
}