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m Open access bot: doi added to citation with #oabot. |
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Line 81:
| title = Guthrie's problem: new equivalences and rapid reductions
| volume = 154
| year = 1996
}}.
*{{citation
| last = Eppstein | first = David
Line 155 ⟶ 156:
| title = Graph minors. X. Obstructions to tree-decomposition
| volume = 52
| year = 1991
}}.
*{{citation
| last1 = St. John | first1 = Katherine
|