The T-join Problem in Sparse Graphs: Applications to Phase Assignment Problem in VLSI Mask Layout.

Piotr Berman Andrew B. Kahng Devendra Vidhani Alexander Zelikovsky The T-join Problem in Sparse Graphs: Applications to Phase Assignment Problem in VLSI Mask Layout. 25-36 http://link.springer.de/link/service/series/0558/bibs/1663/16630025.htm 1999 conf/wads/1999 WADS db/conf/wads/wads99.html#BermanKVZ99