@article{GDZPPN002026821,
title = {Improved Bound for the Disk-packing Constant (Short Communication)},
journal = {Aequationes mathematicae},
volume = {9},
year = {1973},
pages = {115-116},
url = {http://dml.mathdoc.fr/item/GDZPPN002026821}
}
BOYD, DAVID W. Improved Bound for the Disk-packing Constant (Short Communication). Aequationes mathematicae, Tome 9 (1973) pp. 115-116. http://gdmltest.u-ga.fr/item/GDZPPN002026821/