Highly efficient gradient computation for density-constrained analytical placement methods.

Jason Cong Guojie Luo Highly efficient gradient computation for density-constrained analytical placement methods. 39-46 2008 ISPD http://doi.acm.org/10.1145/1353629.1353639 conf/ispd/2008 db/conf/ispd/ispd2008.html#CongL08