New Upper Bounds on A(n,d)
  Upper bounds on the maximum number of codewords in a binary code of a given length and minimum Hamming distance are considered. New bounds are derived by a combination of linear programming and counting arguments. Some of these bounds improve on the best known analytic bounds. Several new record bounds are obtained for codes with small lengths. 
Beniamin Mounits (1), Tuvi Etzion (1) and Simon Litsyn (2) ((1)   Technion - Israel Institute of Technology, (2) Tel Aviv Un...