A polynomial time approximation scheme for timing constrained minimum cost layer assignment.

Shiyan Hu Zhuo Li Charles J. Alpert A polynomial time approximation scheme for timing constrained minimum cost layer assignment. 112-115 2008 ICCAD http://doi.acm.org/10.1145/1509456.1509491 conf/iccad/2008 db/conf/iccad/iccad2008.html#HuLA08