@article{AM2_1973__9_136331,
     author = {DAVID W. BOYD},
     title = {Improved {Bound} for the {Disk-packing} {Constant} {(Short} {Communication)}},
     journal = {Aequationes mathematicae},
     pages = {115--116},
     publisher = {mathdoc},
     volume = {9},
     year = {1973},
     url = {http://geodesic.mathdoc.fr/item/AM2_1973__9_136331/}
}