@article{Bodlaender95,
author = "Hans L. Bodlaender and John R. Gilbert and Hj{\'a}lmt{\'y}r Hafsteinsson and Ton Kloks",
journal = "Journal of Algorithms",
pages = "238-255",
title = "{A}pproximating {T}reewidth, {P}athwidth, {F}rontsize, and
                   {S}hortest {E}limination {T}ree",
volume = "18",
year = "1995",
}