On the limiting power of set of knots generated by 1+1- and 2+1- braids
  We estimate from above the set of knots, $\Omega(n,\mu)$, generated by closure of n-string 1+1- and 2+1-dimensional braids of irreducible length $\mu$ ($\mu>>1$) in the limit n>>1. 
R. Bikbov, S. Nechaev