R
[RS84] Neil Robertson and Paul D. Seymour. Graph minors III: Planar tree-width. Journal of Combinatorial Theory, series B 86(1):49-64. Elsevier, February 1984. 
@article{jctB36(1)-RS,
  author =              {Robertson, Neil and Seymour, Paul D.},
  title =               {Graph minors~{III}: Planar tree-width},
  publisher =           {Elsevier},
  journal =             {Journal of Combinatorial Theory, series~{B}},
  volume =              {86},
  number =              {1},
  pages =               {49-64},
  year =                {1984},
  month =               feb,
  doi =                 {10.1016/0095-8956(84)90013-3},
}
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