Zhengbing Bian Qian-Ping Gu Marjan Marzban Hisao Tamaki Yumi Yoshitake Empirical Study on Branchwidth and Branch Decomposition of Planar Graphs. 152-165 2008 ALENEX http://www.siam.org/proceedings/alenex/2008/alx08_015bianz.pdf conf/alenex/2008 db/conf/alenex/alenex2008.html#BianGMTY08