@article{JGAA_2004_8_3_a2,
     author = {Kim Marriott and Peter Stuckey},
     title = {NP-Completeness of {Minimal} {Width} {Unordered} {Tree} {Layout}},
     journal = {Journal of Graph Algorithms and Applications},
     pages = {295--312},
     publisher = {mathdoc},
     volume = {8},
     number = {3},
     year = {2004},
     doi = {10.7155/jgaa.00093},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00093/}
}