@article{JGG_2000_4_2_a0,
     author = { H. S. M. Coxeter},
     title = {Five {Spheres} in {Mutual} {Contact}},
     journal = {Journal for geometry and graphics},
     pages = {109--114},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {2000},
     url = {http://geodesic.mathdoc.fr/item/JGG_2000_4_2_a0/}
}