An impossibility gap between width-4 and width-5 permutation branching programs.

Alex Brodsky An impossibility gap between width-4 and width-5 permutation branching programs. 159-164 2005 94 Inf. Process. Lett. 4 http://dx.doi.org/10.1016/j.ipl.2005.01.012 db/journals/ipl/ipl94.html#Brodsky05