@article{JGG_2011_15_2_JGG_2011_15_2_a3,
     author = {K. Morita },
     title = {Some {Theorems} on {Kissing} {Circles} and {Spheres}},
     journal = {Journal for geometry and graphics},
     pages = {159--168},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {2011},
     url = {http://geodesic.mathdoc.fr/item/JGG_2011_15_2_JGG_2011_15_2_a3/}
}