@article{AM2_1971__7_136231,
     author = {DAVID W. BOYD},
     title = {The {Disk-Packing} {Constant} {(Short} {Communication)}},
     journal = {Aequationes mathematicae},
     pages = {113--114},
     publisher = {mathdoc},
     volume = {7},
     year = {1971},
     url = {http://geodesic.mathdoc.fr/item/AM2_1971__7_136231/}
}