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@article{AM2_1973__9_136329, author = {DAVID W. BOYD}, title = {Improved {Bounds} for the {Disk-packing} {Constant}}, journal = {Aequationes mathematicae}, pages = {99--106}, publisher = {mathdoc}, volume = {9}, year = {1973}, zbl = {0255.52006}, url = {http://geodesic.mathdoc.fr/item/AM2_1973__9_136329/} }
DAVID W. BOYD. Improved Bounds for the Disk-packing Constant. Aequationes mathematicae, Tome 9 (1973), pp. 99-106. http://geodesic.mathdoc.fr/item/AM2_1973__9_136329/