@article{OstBla:size,
author = {Patric R.J. \"Osterg\aard and Uri Blass},
journal = {{IEEE} Transactions on Information Theory},
number = {6},
pages = {2556--2557},
title = {On the Size of Optimal Binary Codes of Length 9 and Covering Radius 1},
volume = {47},
year = {2001},
}