VNP completeness of Permanent Can some one suggest a good source for VNP completeness of Permanent. I tried reading it from book on Algebraic complexity theory by Burgisser,clausen,shokrollahi,lickteig. 
And What is the best known lower-bound on determinental complexity of $PERM_{n}$?
The place from which I had read the proof was Completeness and Reduction in Algebraic Complexity Theory by Peter Bürgisser (.ps). As for the determinental complexity of the permanent, the best lower bound known so far is $\Omega(n^2)$ by Mignon and Ressayre.