Improved lower bound on the number of balanced symmetric functions over GF.

Pinhui Ke Liuling Huang Shengyuan Zhang Improved lower bound on the number of balanced symmetric functions over GF. 682-687 2009 179 Inf. Sci. 5 http://dx.doi.org/10.1016/j.ins.2008.10.003 db/journals/isci/isci179.html#KeHZ09